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 genre/format terms (TGM II) follow. A separate genre/format term list for downloading will continue to be available. Guidelines for subject indexing (TGM I) are available at the TGM I home page.

TGM is searchable through the Prints and Photographs Online Catalog (PPOC) and the Library's Linked Data Service.

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).