Thesaurus for Graphic Materials I: Subject Terms (TGM I)
INTRODUCTION (1995 printed edition)

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III. Subject Heading Strings and Subdivisions


III.D. Topical Subdivisions


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 eight 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.

  1. Appendix A: Subdivisions Used With Names of Ethnic, Racial, and Regional Groups and With Classes of Persons (e.g., Hawaiians, Indians of North America, Mexican Americans) and eight particular classes of persons (Children; Gays; Indigenous peoples; Men; Older people; People with disabilities; Teenagers; Women). Names of ethnic, racial, and regional groups come from LCSH; the eight classes of persons are terms found in TGM I. The subject heading strings are entered in MARC field 650.

  2. Appendix B: Subdivisions Used With Names of Persons (e.g., Elizabeth I, Queen of England, 1533-1605; Washington, George, 1732-1799). Names are taken from the Library of Congress Name Authority File or formulated according to AACR2 guidelines. The subject heading strings are entered in MARC field 600.

  3. Appendix C: Subdivisions Used With Names of Wars (e.g., Spanish American War, 1898; United States--History--Civil War, 1861-1865; World War, 1939- 1945). The names come from LCSH. Depending on the nature of the heading, the subject heading strings are entered in MARC field 650 or 651.

  4. Appendix D: Subdivisions Used With Corporate Bodies and Named Events (e.g., Fort Monroe (Va.); National Association for the Advancement of Colored People; United States. Army, Cavalry, 6th; World's Columbian Exposition (1893: Chicago : Ill.)). Names come from the Library of Congress Name Authority File. Depending on the nature of the heading, the subject heading strings are entered in MARC field 610, 611, 650, or 651.

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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