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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Alexander von Humboldt's System Der Isotherm-Kurven, in Merkator's Projection" The New York Public Library Digital Collections. 1849. https://digitalcollections.nypl.org/items/4d79ec30-5236-0136-b8e4-63e7bf5855d2
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Alexander von Humboldt's System Der Isotherm-Kurven, in Merkator's Projection" New York Public Library Digital Collections. Accessed December 11, 2024. https://digitalcollections.nypl.org/items/4d79ec30-5236-0136-b8e4-63e7bf5855d2
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1849). Alexander von Humboldt's System Der Isotherm-Kurven, in Merkator's Projection Retrieved from https://digitalcollections.nypl.org/items/4d79ec30-5236-0136-b8e4-63e7bf5855d2
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/4d79ec30-5236-0136-b8e4-63e7bf5855d2 | title=
(cartographic)
Alexander von Humboldt's System Der Isotherm-Kurven, in Merkator's Projection, (1849)
|author=Digital Collections, The New York Public Library |accessdate=December 11, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>