Thesaurus for Graphic Materials I: Subject Terms (TGM I)
Compiled by Prints and Photographs Division
Library of Congress

The Thesaurus for Graphic Materials is a tool for indexing visual materials by subject and genre/format. The thesaurus includes more than 7,000 subject terms to index topic shown or reflected in pictures, and 650 genre/format terms to index types of photographs, prints, design drawings, ephemera and other categories. New terms are added regularly.  TGM is searchable through the Prints and Photographs Online Catalog (PPOC). [Search TGM] [view PPOC introduction]
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As of October 2007, the Thesaurus for Graphic Materials I: Subject Terms (TGM I) and the Thesaurus for Graphic Materials II: Genre and Physical Characteristic Terms (TGM II) were merged into a single vocabulary, the Thesaurus for Graphic Materials, and migrated to new software. The merged TGM is available for searching in the Prints & Photographs Online Catalog (PPOC). Application guidelines for subject indexing (TGM I) follow. Application guidelines for genre/format terms (TGM II) and a separate genre/format term list for downloading will continue to be available at the TGM II home page.

Although the thesaurus content remains essentially the same, there are some minor changes in field structure and labeling. For example, Public Note is now called Scope Note. Additionally, new fields were added to clarify term usage. For further information on these changes see "Fields in Term Record Displays" (via PPOC - About the Thesaurus).

Introduction to TGM I: Table of Contents
Last revised, 1995



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