Useful links for San Francisco history research:

FoundSF
San Francisco History Index
Virtual San Francisco Museum
Shaping San Francisco

We also suggest you contact the following:

San Francisco Public Library: San Francisco History Center
100 Larkin Street San Francisco, CA 94102; 415-557-4567; sfpl.org

California Historical Society
678 Mission Street, San Francisco, CA 94105; 415-357-1848; calhist.org

Society of California Pioneers: Alice Phelan Sullivan Library
101 Montgomery Street, Suite 150, Presidio of San Francisco, San Francisco, CA 94129; 415-957-1849; CaliforniaPioneers.org

Bancroft Library
University of California, Berkeley, CA 94720-6000; 510-642-3781; bancroft.berkeley.edu

Mechanics’ Institute Library
57 Post Street, San Francisco, CA 94104-5013; 415-393-0101; milibrary.org

California Genealogical Society
2201 Broadway, Suite LL2, Oakland, CA 94612; 510-663-1358; CaliforniaAncestors.org

California History Resource Guide
San Francisco Historical Resources section; tripbuzz.com/california-history-guide/

San Francisco Bay Area Television Archive
J. Paul Leonard Library, San Francisco State University, 415-405-5565; library.sfsu.edu/bata-old

Museum of Performance and Design
893B Folsom Street, San Francisco, CA 94107; 415-255-4800; mpdsf.org

San Francisco Bay Area Post Card Club
P.O. Box 621, Penngrove, CA 94951; postcard.org