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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Sketch illustrating the progress of the survey of the coast in 1845 showing the positions occupied in making observations upon currents in New York Bay & Harbor and the East River." The New York Public Library Digital Collections. 1845. https://digitalcollections.nypl.org/items/06b633b0-c5ab-012f-bfd1-58d385a7bc34
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Sketch illustrating the progress of the survey of the coast in 1845 showing the positions occupied in making observations upon currents in New York Bay & Harbor and the East River." New York Public Library Digital Collections. Accessed May 17, 2025. https://digitalcollections.nypl.org/items/06b633b0-c5ab-012f-bfd1-58d385a7bc34
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1845). Sketch illustrating the progress of the survey of the coast in 1845 showing the positions occupied in making observations upon currents in New York Bay & Harbor and the East River. Retrieved from https://digitalcollections.nypl.org/items/06b633b0-c5ab-012f-bfd1-58d385a7bc34
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/06b633b0-c5ab-012f-bfd1-58d385a7bc34 | title=
(cartographic)
Sketch illustrating the progress of the survey of the coast in 1845 showing the positions occupied in making observations upon currents in New York Bay & Harbor and the East River., (1845)
|author=Digital Collections, The New York Public Library |accessdate=May 17, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>