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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological map of a part of the state of California explored in 1855 by Lieut. R.S. Williamson U.S. Top. Engr. " The New York Public Library Digital Collections. 1855. https://digitalcollections.nypl.org/items/960257a0-007f-0136-093b-2b888eab9bbb
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological map of a part of the state of California explored in 1855 by Lieut. R.S. Williamson U.S. Top. Engr. " New York Public Library Digital Collections. Accessed January 29, 2025. https://digitalcollections.nypl.org/items/960257a0-007f-0136-093b-2b888eab9bbb
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1855). Geological map of a part of the state of California explored in 1855 by Lieut. R.S. Williamson U.S. Top. Engr. Retrieved from https://digitalcollections.nypl.org/items/960257a0-007f-0136-093b-2b888eab9bbb
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/960257a0-007f-0136-093b-2b888eab9bbb | title=
(cartographic)
Geological map of a part of the state of California explored in 1855 by Lieut. R.S. Williamson U.S. Top. Engr. , (1855)
|author=Digital Collections, The New York Public Library |accessdate=January 29, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>