The original SF Call appeared on the streets of San Francisco from 1856 to 1965, when it merged with the San Francisco Examiner. Microfilmed copies are available in the San Francisco Public Library. The California Digital Newspaper Collection has copies online.
A completely different SF Call appeared in print and online from 2000 to 2005, offering progressive commentary about current events in San Francisco and elsewhere. It's still online. Please feel free to visit the old SF Call.
If you like what you read here, you might want to check out the Call's sister paper, the San Francisco Flier.