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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Isothermal chart of the region north of the 36th parallel &c. &c. between the Atlantic & Pacific ocean" The New York Public Library Digital Collections. 1859. https://digitalcollections.nypl.org/items/ecc48780-1f52-0133-dd9c-58d385a7b928
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Isothermal chart of the region north of the 36th parallel &c. &c. between the Atlantic & Pacific ocean" New York Public Library Digital Collections. Accessed January 16, 2025. https://digitalcollections.nypl.org/items/ecc48780-1f52-0133-dd9c-58d385a7b928
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1859). Isothermal chart of the region north of the 36th parallel &c. &c. between the Atlantic & Pacific ocean Retrieved from https://digitalcollections.nypl.org/items/ecc48780-1f52-0133-dd9c-58d385a7b928
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/ecc48780-1f52-0133-dd9c-58d385a7b928 | title=
(cartographic)
Isothermal chart of the region north of the 36th parallel &c. &c. between the Atlantic & Pacific ocean, (1859)
|author=Digital Collections, The New York Public Library |accessdate=January 16, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>