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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological sections of the Bernardino Pass, explored by Lieut. R.S. Williamson in 1853 " The New York Public Library Digital Collections. 1853. https://digitalcollections.nypl.org/items/11860740-fafe-0135-541f-712c3e7ef940
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Geological sections of the Bernardino Pass, explored by Lieut. R.S. Williamson in 1853 " New York Public Library Digital Collections. Accessed April 19, 2021. https://digitalcollections.nypl.org/items/11860740-fafe-0135-541f-712c3e7ef940
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1853). Geological sections of the Bernardino Pass, explored by Lieut. R.S. Williamson in 1853 Retrieved from https://digitalcollections.nypl.org/items/11860740-fafe-0135-541f-712c3e7ef940
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/11860740-fafe-0135-541f-712c3e7ef940 | title=
(cartographic)
Geological sections of the Bernardino Pass, explored by Lieut. R.S. Williamson in 1853 , (1853)
|author=Digital Collections, The New York Public Library |accessdate=April 19, 2021 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>