OpenSFHistory:  https://opensfhistory.org/

Cliff House Restaurant website:  www.cliffhouse.com

National Park Service:  https://www.nps.gov/goga/learn/historyculture/cliff-house.htm
     Visitor contact #:  (415) 561-4323
     Email contact: goga_web_coordinator@nps.gov

Park Archives & Records Center, Nat'l Park Service, Golden Gate Nat'l Recreation Area   (415) 561-4807

SF Memories (more great pics):  http://www.sanfranciscomemories.com/cliff/house.html

Giant Camera information:  http://brightbytes.com/cosite/sanfran.html

San Francisco Bay Area Post Card Club, an incredible collection of online SF postcards and a great place for collectors to meet:
   Postcard.org    *** Newsletter published 10 months a year, with PDF versions available online.

History Smith - excerpted from San Francisco's Lost Landmarks. story of the Parallel explosion: http://www.historysmith.com/tales_sf_lost_land_01.html

Cable Car Museum - a very comprehensive website dedicated to San Francisco's cable cars.

An excellent site for purchasing stereoviews, plus great source for information: http://www.stereoviews.com

San Francisco Public Library (incredible online photo archive)  http://sflib1.sfpl.org:82/search/X

California Heritage Collection, The Bancroft Library, UC Berkeley:  http://www.oac.cdlib.org

MisterSF.com, the best place to keep in touch with today's San Francisco:  www.mistersf.com

A website with some great Sutro Baths images:  http://www.squareone.org/PolarPalace/sutros.html

PdxHistory.com - Portland, but also SF history:  http://www.pdxhistory.com/html/san_francisco.html

Ron Henggeler Photography - great photos of present day San Francisco, with a keen eye for historical detail.  Nobody captures SF like Ron.

Using San Francisco History - a really interesting perspective on SF History:  http://usingsfhistory.com/

SepiaTown - a mashup of historic images superimposed on google maps:  http://www.sepiatown.com/

Info on Harold G. Stoner, the architect of the Tropic Beach facade and ice rink for the Sutro Baths:  www.JacquieProctor.com