[Classweb-users] Architecture--History

[Robboy, William]

John, I don't know if someone has already addressed your first question off-list, but I hope this helps:

No, the two sets of authority records do not cancel each other out; they complement each other.  The "used for" references traced in 450 fields point to specific target headings, on whose subject authority records they are traced; the target headings appear in field 150 on those records.  The subject authority records with 260 fields in them do not represent headings; they represent general see references.  (Besides the 260 field, the other telltale sign is code b or c in 008/09.)  The references in 260 are made from the unauthorized terms in 150, in cases where the target of the reference is not a specific heading but a whole category of headings.  For the architectural history headings, we need both kinds of references in order capture all the appropriate places where users might look (or all the valid headings that catalogers might assign) instead of the unauthorized terms from which the references are made. General see references are explained in broad strokes in the Introduction to the Library of Congress Subject Headings, and in more technical detail in Subject Headings Manual H 374.

This is not an official communication of the Library of Congress.

William L. Robboy, Librarian
Mexico, Central America & Caribbean Section
Acquisitions & Bibliographic Access Directorate
Library of Congress
wrobboy at loc.gov
202 707-3329


-----Original Message-----
From: Classweb-users <classweb-users-bounces at classificationweb.net> On Behalf Of Hostage, John
Sent: Thursday, January 24, 2019 3:54 PM
To: classweb-users at classificationweb.net
Subject: [Classweb-users] Architecture--History

When I browse subjects in ClassWeb I find "Architecture-History" but no further subdivisions for centuries, but in Connexion there are subdivisions for the 17th through 21st centuries.  However, they are in pairs: each century is used as both a 150 and a 450.

The 450s are references to Architecture, Modern-[century] With a 360 (complex see also)

The 150s have a 260 (complex see ref.) to the same headings as in the 360 above.

Are these headings cancelling each other out in ClassWeb?  I think some of these should be deleted.

Another question: how do you do a browse search for a subdivided heading in ClassWeb?  It used to work at least part of the time if you played with the dashes and spaces, but now it seems the only way to get to Architecture-History is to page through many screens of subdivisions.  What am I missing?

------------------------------------------
John Hostage
Senior Continuing Resources Cataloger
Harvard Library--Information and Technical Services Langdell Hall 194 Harvard Law School Library Cambridge, MA 02138 hostage at law.harvard.edu<mailto:hostage at law.harvard.edu>
+(1)(617) 495-3974 (voice)
+(1)(617) 496-4409 (fax)
ISNI 0000 0000 4028 0917

_______________________________________________
Classweb-users mailing list
Classweb-users at classificationweb.net
https://classificationweb.net/listen/listinfo/classweb-users