Consider...
Common Place: An online journal of early American history with scholarly articles on figures such as Fr. Junipero Serra.
California State Library: Online Resources. A list of websites compiled by the California State Library, including sites dedicated to California history and historical figures.
California Digital Newspaper Collection: A digital, searchable, collection of California newspapers dating back to 1846. Newspaper articles are primary sources.
Online Archive of California: Primary sources in California history from smaller historical societies and organizations all over California.
DocsTeach is a collection of thousands of primary source documentson topics such as the Revolution and the new nation, the Civil War and Reconstruction, the Great Depression and World War II, and other topics from the National Archives.