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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "A geological map of Massachusetts" The New York Public Library Digital Collections. 1841. https://old-digitalcollections.nypl.org/items/64771420-534a-0134-ded2-00505686a51c
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "A geological map of Massachusetts" New York Public Library Digital Collections. Accessed October 10, 2026. https://old-digitalcollections.nypl.org/items/64771420-534a-0134-ded2-00505686a51c
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1841). A geological map of Massachusetts Retrieved from https://old-digitalcollections.nypl.org/items/64771420-534a-0134-ded2-00505686a51c
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/64771420-534a-0134-ded2-00505686a51c | title=
(cartographic)
A geological map of Massachusetts, (1841)
|author=Digital Collections, The New York Public Library |accessdate=October 10, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>