GenealogyBank has created a special site for searching California’s historical newspapers.
This site includes 41 newspapers from 1719 to 1922 – from 11 cities.
The cities include: Berkley, Colton, Los Angeles, Monterey, Oakland, Sacramento, San Francisco, San Jose, Santa Monica, Stanford and Stockton.
Genealogists have been heavily searching these early newspapers:
Alta California (San Francisco) 1850-1861
San Joaquin Republican 1855-1860
San Jose Mercury News 1861-1922