The Orange County Historical Society (OCHS) is a non-profit group which collects, preserves and shares the history of Orange County, California for the benefit of its members and the general public.

The Research Library and Archives has been collecting material relating to the history of Pasadena since 1924. The archives contains approximately 1 million historic images (including photos, negatives, postcards, stereographs) of Pasadena and surrounding areas. There are 45 cubic feet of maps and plans of the area, as well as a set of Sanborm fire insurance maps for Pasadena. There is a large…