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Several helpful guides to California place names have been published.
Descriptions and Bibliographic material on published books.
Gudde, Erwin Gustav. California Place Names. (There are many versions of Gudde's book)
Bright, William 1500 California Place Names
Online Digital Copies of Published Books
Index to California Places in the Schellens Collection - San Mateo County Genealogical Society
Digital Atlas of California Professor William Bowen: California State University Northridge