The Prints and Photographs Division has devised topical subdivisions to be used in combination with four categories of Name headings from LCSH or the LC Name Authority File and with six TGM I headings for classes of persons. These subdivisions have been included in Appendices A through D for the convenience of users of Prints and Photographs Division records and for other institutions that might find them useful.
Institutions using TGM I may decide, for a variety of reasons, not to make use of these topical subdivisions. Since public notes (PN's) appearing under many terms in the thesaurus mention related subdivisions to search under, institutions that do not use the subdivisions will probably want to alert their users to this fact.
The question sometimes arises whether the [proper name]--[subdivision] combination and the corresponding TGM I topical term from the main thesaurus list should both be used in the same record. P&P's practice is generally to supply the [proper name]--[subdivision] combination for the broad subject matter of the image and to supply TGM I terms for the specific "of's" and "about's."
Example: Image of airplane production in Fort Worth, Texas, during World War II.
World War, 1939-1945--Economic & industrial aspects--Texas--Fort Worth Airplane industry--Texas--Fort Worth--1940-1950 NOT World War, 1939-1945--Economic & industrial aspects--Texas--Fort Worth Industrial aspects of war--Texas--Forth Worth--1940-1950
MARC coding: When topical subdivisions from TGM I are used with a heading from LCSH or the LC Name Authority File, the second indicator is "4" ("source not specified"). The topical subdivision is assigned subfield code "x."
Example:
650 -4 $a World War, 1939-1945 $x Economic & industrial aspects $z Texas
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