The California Indian History website makes available online primary sources authored or reported by non-Indian witnesses, and oftentimes perpetrators, who documented Euro-American violence against California Indigenous Peoples from the Gold Rush into the second half of the 19th century.
This short 2.5 minute video created by Suffolk County Community College Library provides a broad outline of what Primary, Secondary, and Tertiary Sources are, with examples of each.
You may be surprised to know that there are several special collections or archives located in the United States, in California, in Chico, and on campus. There are several types of Archives, distinguished by their funding sources and the material types they collect.
The following list of potential collections is not exhaustive, but organized to give you a start on your primary source research