LIBRARY OF CONGRESS CYAC SUBJECT HEADINGS
TENTATIVE MONTHLY LIST 09 CYAC (September 2026)


The proposed headings on this list are NOT YET APPROVED and not yet available for use in current cataloging.
Send all comments on this list to the CYAC Program - Email: cyacprog@loc.gov
"(A)" indicates pre-approved proposals for material in Priority 1. "(C)" indicates proposals submitted by libraries in the Subject Authority Cooperative Program (SACO).

 
 
CHILDREN'S SUBJECT HEADINGS
 
150
Adansonias CHANGE HEADING
 
150
Adansonia    [May Subd Geog]    [sp2024050065]
 
053
QK495.M27 (Botany)
 
450
UF Adansonias [Former heading]
 
450
UF Baobab (Genus)
 
450
UF Tree of Life (Baobab)
 
550
BT Mallow family (Plants)
 
680
When this heading is assigned, the second subject heading Trees is also assigned: 1. Adansonia. 2. Trees.
 
688
Established March 2024. Heading changed from Adansonias to Adansonia in September 2026.
 
 
150
Variation (Biology)    [May Subd Geog]    [sp2026050383]
 
053
QH401-QH411 (Biology (General))
 
450
UF Biological variation
 
550
BT Biology
 
680
Here are entered works on the differences in physical traits, behaviors, or genetic makeup between cells or organisms.
 
 
150
Animal variation    [May Subd Geog]    [sp2026050384]
 
053
QH408 (Biology (General))
 
450
UF Animals--Variation
 
550
BT Variation (Biology)
 
680
Here are entered works on the physical, behavioral, or genetic differences between animals. Assign an additional for the type of animal, if appropriate. Fictional works on the physical, behavioral, or genetic differences of anthropomorphic animals are entered under Individual differences.
 
 
150
Animal breeding    [May Subd Geog] CHANGE GEOG    [sp2021058876]
 
053
SF105-SF109 DELETE FIELD
 
053
SF105-SF109 (Animal culture) ADD FIELD
 
360
SA subdivision Breeding under individual animals and groups of animals, e.g. Cattle--Breeding; Fishes--Breeding DELETE FIELD
 
667
Machine-derived authority record. DELETE FIELD
 
680
Here are entered works on the controlled, selective mating of domestic animals by humans. Assign an additional heading for the type of animal or breed, if appropriate. ADD FIELD
 
 
150
Animal burrowing    [May Subd Geog]    [sp2026050385]
 
053
QL756.15 (Zoology)
 
450
UF Burrowing behavior in animals
 
450
UF Burrowing behavior of animals
 
550
BT Animal behavior
 
550
BT Animal locomotion
 
550
RT Burrowing animals
 
680
Assign an additional heading for the type of animal, if appropriate.
 
 
150
Animal classification    [May Subd Geog]    [sp2026050386]
 
053
QL351-QL352 (Zoology)
 
450
UF Animal systematics
 
450
UF Animal taxonomy
 
450
UF Animals--Classification
 
450
UF Systematics (Zoology)
 
550
BT Classification of sciences
 
680
Assign an additional heading for the type of animal, if appropriate.
 
 
150
Animal experimentation CHANGE HEADING
 
150
Animal testing    [May Subd Geog] CHANGE GEOG    [sp2021050131]
 
053
HV4905-HV4959 (Social pathology)
 
450
UF Animal experimentation [Former heading]
 
450
UF Animal research
 
450
UF Animals--Research
 
450
UF Animals--Testing
 
450
UF Experimentation on animals
 
450
UF In vivo testing
 
450
UF Testing on animals
 
450
UF Vivisection [Former heading]
 
550
BT Medical research
 
550
BT Testing
 
550
RT Laboratory animals
 
680
Assign an additional heading for the type of animal, if appropriate.
 
688
Heading changed from Animal experimentation and Vivisection to Animal testing in September 2026.
 
 
150
Medical research    [May Subd Geog]    [sp2026050406]
 
053
R850-R854 (Medicine (General))
 
450
UF Biomedical research
 
450
UF Medicine--Research
 
550
BT Research
 
 
150
Vivisection CANCEL HEADING    [sp2021057648]
 
682
This authority record has been deleted because the subject heading is covered by the subject heading Animal testing (DLC)sj2021050131
 
 
150
Testing    [May Subd Geog]    [sp2025050200]
 
680
Here are entered works on the measurement of quality, function, or reaction. Works on the measurement of knowledge, qualification, or ability of are entered under Examinations. Assign an additional heading for the types of animals, chemicals, materials, instruments, equipment, products, etc. being tested, if appropriate. DELETE FIELD
 
680
Here are entered works on the measurement of quality, function, or reaction. Works on the measurement of knowledge, qualification, or ability of are entered under Examinations. Assign an additional heading for the types of chemicals, materials, instruments, equipment, products, etc., being tested, if appropriate. ADD FIELD
 
 
150
Animal intelligence    [May Subd Geog] CHANGE GEOG    [sp2021053725]
 
053
QL785 DELETE FIELD
 
053
QL785 (Zoology) ADD FIELD
 
360
SA subdivision Psychology under individual animals and groups of animals, e.g. Cattle--Psychology DELETE FIELD
 
450
UF Animal cognition ADD FIELD
 
550
RT Instinct DELETE FIELD
 
550
RT Psychology, Comparative DELETE FIELD
 
667
Machine-derived authority record. DELETE FIELD
 
680
Here are entered works on the cognitive abilities exhibited by animals. Assign an additional heading for the type of animal, if appropriate. Fictional works on the intelligence of anthropomorphic animals are entered under Intellect. ADD FIELD
 
 
150
Learning    [May Subd Geog] ADD GEOG    [sp 96005890 ]
 
053
LB1060 (Theory and practice of education) ADD FIELD
 
450
UF Learning process ADD FIELD
 
550
BT Education ADD FIELD
 
680
This heading is used only with subdivisions. DELETE FIELD
 
680
Here are entered general works on the development of knowledge or skill acquired through formal or informal activities. Works on developing knowledge or skill on a specific topic are entered under the topic. ADD FIELD
 
681
Example under Learning in animals ADD FIELD
 
 
150
Tool use in animals    [May Subd Geog] CHANGE GEOG    [sp2021053557]
 
053
QL785 DELETE FIELD
 
667
Machine-derived authority record. DELETE FIELD
 
680
Here are entered works on the animal use of a separate object to purposefully manipulate their environment. Assign an additional heading for the type of animal, if appropriate. Fictional works on the tool use of anthropomorphic animals are entered under Tools or under a heading for the specific tool. ADD FIELD
 
 
150
Animals--Courtship CHANGE HEADING
 
150
Courtship in animals    [May Subd Geog] ADD GEOG    [sp 96004769 ]
 
450
UF Animal courtship
 
450
UF Animals--Courtship [Former heading]
 
450
UF Courtship behavior in animals
 
450
UF Courtship of animals
 
450
UF Mate choice in animals
 
450
UF Mate selection in animals
 
450
UF Mating behavior
 
550
BT Sexual behavior in animals
 
680
Here are entered works on the ritualistic behaviors animals engage in prior to mating. Assign an additional heading for the type of animal, if appropriate. Fictional works on courtship of anthropomorphic animals are assigned headings intended for humans, e.g., Courtship, Dating, etc.
 
688
Heading changed from Animals--Courtship to Courtship in animals in September 2026.
 
 
150
Apex predators    [May Subd Geog]    [sp2026050388]
 
450
UF Alpha predators
 
450
UF Apex predator
 
450
UF Super predators
 
450
UF Superpredators
 
450
UF Top carnivores
 
450
UF Top predators
 
550
BT Food chains (Ecology)
 
550
BT Predatory animals
 
 
150
Argonauts (Greek mythology)    [Not Subd Geog]    [sp2021055070]
 
053
BL820.A8 (Classical mythology) DELETE FIELD
 
053
BL820.A8 (Religions) ADD FIELD
 
450
UF Argonauts DELETE FIELD
 
550
BT Mythology, Greek DELETE FIELD
 
550
BT Greek mythology ADD FIELD
 
 
150
Biographical sources    [May Subd Geog]    [sp2026050395]
 
450
UF Biographical source materials
 
450
UF Biography--Sources
 
550
BT Primary sources
 
 
150
Blackmail    [May Subd Geog]    [sp2026050405]
 
550
BT Crimes against persons
 
550
BT Extortion
 
 
150
Blogs    [May Subd Geog] CHANGE GEOG    [sp2021053368]
 
053
PN4567.2 (Literature) DELETE FIELD
 
053
TK5105.8884 (Computer networks) DELETE FIELD
 
053
Z674.75.S63 (Library information networks) DELETE FIELD
 
053
PN4567.2 (Social media) ADD FIELD
 
053
Z674.75.S63 (Libraries) ADD FIELD
 
360
SA subdivision Blogs under names of individual persons and corporate bodies, and under classes of persons, ethnic groups, and topical headings DELETE FIELD
 
450
UF Weblogs [Former heading] DELETE FIELD
 
450
UF Blog ADD FIELD
 
450
UF Weblogs ADD FIELD
 
550
RT Citizen journalism DELETE FIELD
 
667
Machine-derived authority record. DELETE FIELD
 
 
150
Video blogs CHANGE HEADING
 
150
Vlogs    [May Subd Geog] CHANGE GEOG    [sp2021061296]
 
053
PN4567.9 (Social media)
 
450
UF Video blogs [Former heading]
 
450
UF Video logs
 
450
UF Vlog
 
450
UF Vlogging
 
550
BT Blogs
 
550
BT Internet videos
 
688
Heading changed from Video blogs to Vlogs in September 2026.
 
 
150
Microblogs    [May Subd Geog] CHANGE GEOG    [sp2021061159]
 
053
PN4567.6 (Social media) ADD FIELD
 
450
UF Tumblelogging DELETE FIELD
 
450
UF Tumblelogs DELETE FIELD
 
450
UF Microblog ADD FIELD
 
550
RT Social networks DELETE FIELD
 
550
RT Online social networks ADD FIELD
 
667
Machine-derived authority record. DELETE FIELD
 
 
150
Body snatching    [May Subd Geog] CHANGE GEOG    [sp2021059931]
 
053
GT3353 (Manners and customs) DELETE FIELD
 
053
GT3353 (Manners and customs (General)) ADD FIELD
 
450
UF Body stealing ADD FIELD
 
550
BT Theft DELETE FIELD
 
550
BT Stealing ADD FIELD
 
667
Machine-derived authority record. DELETE FIELD
 
680
Here are entered works on robbing a grave to obtain a cadaver for dissection. Works on the illegal act of opening burial sites to steal artifacts or valuable grave goods are entered under Grave robbing. ADD FIELD
 
681
Note under Grave robbing ADD FIELD
 
 
150
Grave robbing    [May Subd Geog] CHANGE GEOG    [sp2021059995]
 
450
UF Tomb raiding ADD FIELD
 
450
UF Tomb robbing ADD FIELD
 
550
BT Theft DELETE FIELD
 
550
BT Stealing ADD FIELD
 
667
Machine-derived authority record. DELETE FIELD
 
680
Here are entered works on the illegal act of opening burial sites to steal artifacts or valuable grave goods. Works on robbing a grave to obtain a cadaver for dissection are entered under Body snatching. ADD FIELD
 
681
Note under Body snatching ADD FIELD
 
 
150
Cerberus (Greek mythology)    [Not Subd Geog]    [sp2021058156]
 
053
BL820.C4 (Religion) DELETE FIELD
 
053
BL820.C4 (Religions) ADD FIELD
 
550
BT Mythology, Greek DELETE FIELD
 
550
BT Greek mythology ADD FIELD
 
667
Machine-derived authority record. DELETE FIELD
 
 
150
Cyclopes (Greek mythology)    [Not Subd Geog]    [sp2021053839]
 
053
BL820.C83 (Classical religion and mythology) DELETE FIELD
 
053
BL820.C83 (Religions) ADD FIELD
 
550
BT Mythology, Greek DELETE FIELD
 
550
BT Greek mythology ADD FIELD
 
 
150
Diaries    [May Subd Geog] ADD GEOG    [sp 96005295 ]
 
053
PN4390 (Diaries) ADD FIELD
 
450
UF Diaries (Blank-books) DELETE FIELD
 
450
UF Diary ADD FIELD
 
450
UF Journals (Diaries) ADD FIELD
 
550
BT Biographical sources ADD FIELD
 
 
150
Erinyes (Greek mythology)    [Not Subd Geog]    [sp2021055064]
 
053
BL820.F8 DELETE FIELD
 
053
BL820.F8 (Religions) ADD FIELD
 
550
BT Mythology, Greek DELETE FIELD
 
550
RT Furies (Roman mythology) DELETE FIELD
 
550
BT Greek mythology ADD FIELD
 
667
Machine-derived authority record. DELETE FIELD
 
 
150
Food chains (Ecology)    [May Subd Geog] CHANGE GEOG    [sp2021050997]
 
450
UF Trophic ecology DELETE FIELD
 
550
BT Animals--Food DELETE FIELD
 
550
RT Nutrient cycles DELETE FIELD
 
550
BT Animal food ADD FIELD
 
667
Machine-derived authority record. DELETE FIELD
 
680
When this heading is assigned, the second subject heading Ecology is also assigned: 1. Food chains (Ecology) 2. Ecology. ADD FIELD
 
 
150
Gorgons (Greek mythology)    [Not Subd Geog]    [sp2021058617]
 
550
BT Mythology, Greek DELETE FIELD
 
550
BT Greek mythology ADD FIELD
 
 
150
Home range (Animal geography)    [May Subd Geog]    [sp2026050389]
 
450
UF Animal movement patterns
 
450
UF Animal movements (Animal geography)
 
450
UF Animals--Home range
 
450
UF Home ranges (Animal geography)
 
450
UF Movement patterns of animals
 
450
UF Movements of animals (Animal geography)
 
550
BT Animal distribution
 
680
Here are entered works on an area that an animal frequently uses but does not defend. Assign an additional heading for the type of animal, if appropriate. Works on the active defense by an animal of a specific geographic area against intrusion from other animals are entered under Territoriality (Zoology).
 
681
Note under Territoriality (Zoology)
 
 
150
Territoriality (Zoology)    [May Subd Geog] CHANGE GEOG    [sp2021052411]
 
360
SA subdivision Territoriality under individual animals and groups of animals, e.g. Fishes--Territoriality DELETE FIELD
 
450
UF Proxemic behavior in animals DELETE FIELD
 
550
BT Spatial behavior in animals DELETE FIELD
 
550
BT Animal behavior ADD FIELD
 
667
Machine-derived authority record. DELETE FIELD
 
680
Here are entered works on the active defense by an animal of a specific geographic area against intrusion from other animals. Assign an additional heading for the type of animal, if appropriate. Works on an area that an animal frequently uses but does not defend are entered under Home range (Animal geography). ADD FIELD
 
681
Note under Home range (Animal geography) ADD FIELD
 
 
150
Identification cards    [May Subd Geog]    [sp2026050397]
 
450
UF Credentials (Identification cards)
 
450
UF I.D. cards
 
450
UF Identification card
 
450
UF Identity cards
 
450
UF IDs (Identification cards)
 
550
BT Vital records
 
 
150
Imaginary letters CANCEL HEADING    [sp2021058251]
 
682
This authority record has been deleted because the subject heading is covered by the subject heading Letters (DLC)sj2021050693.
 
 
150
Ladon (Greek mythology)    [Not Subd Geog]    [sp2021055874]
 
053
BL820.L25 DELETE FIELD
 
053
BL820.L25 (Religions) ADD FIELD
 
550
BT Mythology, Greek DELETE FIELD
 
550
BT Greek mythology ADD FIELD
 
667
Machine-derived authority record. DELETE FIELD
 
 
150
Letters    [Not Subd Geog]    [sp2021050693]
 
053
PN4400 (History and criticism) DELETE FIELD
 
053
PN6130-PN6140 (Collections) DELETE FIELD
 
053
PN4400 (Anthologies) ADD FIELD
 
053
PN6130-PN6140 (Collections of general literature) ADD FIELD
 
360
SA headings for letters qualified by language, region, or nationality, e.g. American letters; European letters; Latin letters DELETE FIELD
 
667
Machine-derived authority record. DELETE FIELD
 
 
150
Love-letters CHANGE HEADING
 
150
Love letters    [Not Subd Geog]    [sp2021059454]
 
053
HQ801.3-HQ801.5 (The family)
 
053
PN6140.L7 (Collections of general literature)
 
053
PR1349.L8 (English literature)
 
053
PS673.L7 (American literature)
 
450
UF Love letter
 
550
BT Letters
 
 
150
Thank-you notes    [Not Subd Geog]    [sp2021060344]
 
053
BJ2065.T53 (Wedding etiquette) DELETE FIELD
 
053
BJ2065.T53 (Social usages) ADD FIELD
 
450
UF Notes, Thank-you DELETE FIELD
 
450
UF Thank-you cards ADD FIELD
 
550
BT Stationery ADD FIELD
 
667
Machine-derived authority record. DELETE FIELD
 
 
150
Library cards    [May Subd Geog]    [sp2026050398]
 
450
UF Borrower's cards (Libraries)
 
550
BT Identification cards
 
 
150
Loblolly pines    [May Subd Geog]    [sp2026050400]
 
053
QK494.5.P66 (Botany)
 
053
SD397.P58 (Forestry)
 
450
UF Loblolly pine
 
450
UF Oldfield Pine
 
450
UF Pinus taeda
 
550
BT Pines
 
680
When this heading is assigned, the second subject heading Trees is also assigned: 1. Loblolly pines. 2. Trees.
 
 
150
Mythology, Classical CHANGE HEADING
 
150
Classical mythology    [Not Subd Geog]    [sp2021053946]
 
053
BL700-BL820 (Religions)
 
450
UF Mythology, Classical [Former heading]
 
550
BT Mythology
 
688
Heading changed from Mythology, Classical to Classical mythology in September 2026.
 
 
150
Greek mythology    [May Subd Geog]    [sp2021050983]
 
550
BT Mythology DELETE FIELD
 
550
BT Classical mythology ADD FIELD
 
688
Heading changed from Mythology, Greek to Greek mythology in September 2026. ADD FIELD
 
 
150
Roman mythology    [May Subd Geog]    [sp2021051119]
 
550
BT Mythology DELETE FIELD
 
550
BT Classical mythology ADD FIELD
 
 
150
Nemean lion (Greek mythology)    [Not Subd Geog]    [sp2021055092]
 
053
BL820.N47 DELETE FIELD
 
053
BL820.N47 (Religions) ADD FIELD
 
550
BT Lion--Mythology DELETE FIELD
 
550
BT Mythology, Greek DELETE FIELD
 
550
BT Greek mythology ADD FIELD
 
667
Machine-derived authority record. DELETE FIELD
 
 
150
Nest building    [May Subd Geog] CHANGE GEOG    [sp2021057728]
 
360
SA subdivision Nests under individual animals and groups of animals, e.g. Fishes--Nests DELETE FIELD
 
450
UF Building, Nest DELETE FIELD
 
450
UF Building nests [Former heading] DELETE FIELD
 
450
UF Construction, Nest DELETE FIELD
 
450
UF Building nests ADD FIELD
 
667
Machine-derived authority record. DELETE FIELD
 
680
Assign an additional heading for the type of animal, if appropriate. ADD FIELD
 
 
150
Nests    [May Subd Geog] CHANGE GEOG    [sp2021056648]
 
360
SA subdivision Nests under individual animals and groups of animals, e.g. Fishes--Nests DELETE FIELD
 
550
BT Animals--Habitations DELETE FIELD
 
550
BT Animal habitations ADD FIELD
 
667
Machine-derived authority record. DELETE FIELD
 
680
Assign an additional heading for the type of animal, if appropriate. ADD FIELD
 
 
150
Parental behavior in animals    [May Subd Geog] CHANGE GEOG    [sp2021050308]
 
053
QL762 DELETE FIELD
 
053
QL762 (Zoology) ADD FIELD
 
550
RT Cooperative breeding in animals DELETE FIELD
 
667
Machine-derived authority record. DELETE FIELD
 
680
Here are entered works on the actions, caregiving, and interactions animal parents use to raise and protect their offspring. Assign an additional heading for the type of animal, if appropriate. Fictional works on the parental behavior in anthropomorphic animals are assigned headings intended for humans, e.g., Parents. ADD FIELD
 
 
150
Predation (Biology)    [May Subd Geog] CHANGE GEOG    [sp2021055018]
 
053
QL758 (Animal behavior) DELETE FIELD
 
053
QL758 (Zoology) ADD FIELD
 
360
SA subdivision Effect of predation on under individual animals and groups of animals, e.g. Fishes--Effect of predation on DELETE FIELD
 
450
UF Communities, Predator-prey DELETE FIELD
 
450
UF Dynamics, Predator-prey DELETE FIELD
 
450
UF Interactions, Predator-prey DELETE FIELD
 
450
UF Relations, Predator-prey DELETE FIELD
 
450
UF Relationships, Predator-prey DELETE FIELD
 
450
UF Systems, Predator-prey DELETE FIELD
 
550
BT Animals--Food DELETE FIELD
 
550
RT Parasitism DELETE FIELD
 
550
BT Animal food ADD FIELD
 
667
Machine-derived authority record. DELETE FIELD
 
 
150
Primary sources    [May Subd Geog]    [sp2026050394]
 
053
D5-D5.5 (History (General))
 
450
UF Historical source material
 
450
UF Historical sources
 
450
UF History--Sources
 
680
Here are entered collections of documents, records, etc. upon which narrative history is based.
 
 
150
Public services (Libraries)    [May Subd Geog]    [sp2026050399]
 
450
UF Libraries--Public services
 
450
UF Libraries--Services to users
 
450
UF Libraries and readers
 
450
UF Library public services
 
450
UF Library services to users
 
450
UF Library users--Services for
 
450
UF Public libraries--Services to users
 
550
BT Library science
 
 
150
Satyrs (Greek mythology)    [Not Subd Geog]    [sp2021058506]
 
053
BL820.S3 DELETE FIELD
 
053
BL820.S3 (Religions) ADD FIELD
 
550
BT Mythology, Greek DELETE FIELD
 
550
BT Greek mythology ADD FIELD
 
 
150
Scylla and Charybdis (Greek mythology)    [Not Subd Geog]    [sp2021057433]
 
053
BL820.S39 DELETE FIELD
 
053
BL820.S39 (Religions) ADD FIELD
 
550
BT Mythology, Greek DELETE FIELD
 
550
BT Greek mythology ADD FIELD
 
667
Machine-derived authority record. DELETE FIELD
 
 
150
Social conflict    [May Subd Geog]    [sp2026050401]
 
053
HM1121 (Sociology)
 
450
UF Class conflict
 
450
UF Class struggle
 
450
UF Social tensions
 
550
BT Social psychology
 
 
150
Threats    [May Subd Geog]    [sp2026050377]
 
450
UF Threat
 
550
BT Social conflict
 
550
RT Extortion
 
 
150
Death threats    [May Subd Geog] CHANGE GEOG    [sp2021060371]
 
450
UF Death threat ADD FIELD
 
550
BT Threats of violence DELETE FIELD
 
550
BT Threats ADD FIELD
 
667
Machine-derived authority record. DELETE FIELD
 
 
150
Species distribution    [May Subd Geog]    [sp2026050387]
 
053
QH84-QH198 (Natural history (General))
 
450
UF Areography (Biology)
 
450
UF Biogeography
 
450
UF Geographical distribution of species
 
450
UF Species--Geographical distribution
 
550
BT Biology
 
550
BT Geography
 
 
150
Animal distribution    [May Subd Geog] ADD GEOG    [sp 96004735 ]
 
053
QL101-QL345 (Zoology) ADD FIELD
 
450
UF Animal geography ADD FIELD
 
450
UF Animals--Geographical distribution ADD FIELD
 
450
UF Geographical distribution of animals ADD FIELD
 
450
UF Zoology--Geographical distribution ADD FIELD
 
550
BT Species distribution ADD FIELD
 
680
Assign an additional heading for the type of animal, if appropriate. ADD FIELD
 
 
150
Vital records    [May Subd Geog]    [sp2026050396]
 
053
HA38-HA39 (Statistics)
 
450
UF Adoption records
 
450
UF Birth records
 
450
UF Death records
 
450
UF Divorce records
 
450
UF Marriage records
 
450
UF Registers of births, etc.
 
450
UF Registers of deaths
 
550
BT Biographical sources
 
550
BT Genealogy
 
 
150
Wills    [May Subd Geog] CHANGE GEOG    [sp2021058914]
 
360
SA subdivision Will under names of individual persons DELETE FIELD
 
450
UF Will (Legal documents) ADD FIELD
 
550
BT Legal instruments DELETE FIELD
 
550
BT Registers of births, etc. DELETE FIELD
 
550
RT Legacies DELETE FIELD
 
550
RT Probate records DELETE FIELD
 
550
RT Remainders (Estates) DELETE FIELD
 
550
BT Legal documents ADD FIELD
 
550
BT Vital records ADD FIELD
 
667
Machine-derived authority record. DELETE FIELD