In 1938 an inventory of the Archives of San Mateo County was taken as part of the Historical Records Survey: Division of Women's and Professional Projects - Work Progress Administration. It was published by the Historical Records Survey in San Francisco in June 1838. While delving into the drawers at the County Record Repository many years ago, a copy of the publication was found. This is a digitized copy. In it you will find a listing of all the found records by department. As we search for records of the past this is a guide to what existed just prior to WWII.
Historical Records Survey #42 - San Mateo County
Historical Records Survey - Living New Deal
Historical Records Survey - Wikipedia
Historical Records Survey - Guide to Unpublished
NARA Records of the Work Progress Administration
Historical Records of County Government in California
In 1981, Secretary of State, March Fong Eu, in conjunction with the State Archives, the California Historical Records and Consultant Service with funding from the National Historical Publications and Records Commission, created "Identification of the Historical Records of County Government in California." This document provides a helpful description of the records that should be found in every county in the state.
Identification of the Historical Records of County Gov. in CA