Recommended Websites:

California Missions Resource Center features key facts about the missions with maps, timelines, and images.
California Gold Rush is an interactive website with information on the people and history of the Gold Rush.  Virtual tours of current exhibits at the Oakland California Gold Rush Museum are available online, and historical images are displayed.
California Native Tribes at Internet Public Library offers a portal to information on the history and culture of Native American tribes in California and the US.
Early California History  The Library of Congress American Memory website offers detailed information on early California, its geography, inhabitants, and history.  Included are primary resource materials
Calisphere UC Libraries California Digital Collection offers photographs, works of art, and other primary sources from California history.