Duke University
California Gold: The Diary and Letters of James M. Burr
Wonderful primary resource on the California Gold Rush. Read actual letters and a diary--with explanatory annotations--by a prospector from 1850-1853.
Huntington Library
Huntington Library: Land of Golden Dreams: California in the Gold Rush
A rich site on the California gold rush, 1848-1858. An online exhibit traces the gold rush using primary sources, a teacher page gives lesson plans from 4-12 and a kid's page offers further online adventures. Takes a long time to load.