The papers of Betsy Thomas span the years 1960 to 2007, with the exception of a class photo from 1918 with unidentified subjects and significance. The bulk of the material covers the years 1978 to 1996.

The Betsy Thomas papers contain records from both her roles in the University of Idaho Women’s Center and with the National Organization for Women. Materials include correspondence, publications, educational materials, as well as national, regional, and state, and chapter records for the National Organization for Women.