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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Northern coast of Long Island Sound from Delancey Point to Calves Island" The New York Public Library Digital Collections. 1870. https://old-digitalcollections.nypl.org/items/ac0509b0-3010-0134-741f-00505686a51c
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Northern coast of Long Island Sound from Delancey Point to Calves Island" New York Public Library Digital Collections. Accessed September 27, 2026. https://old-digitalcollections.nypl.org/items/ac0509b0-3010-0134-741f-00505686a51c
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1870). Northern coast of Long Island Sound from Delancey Point to Calves Island Retrieved from https://old-digitalcollections.nypl.org/items/ac0509b0-3010-0134-741f-00505686a51c
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/ac0509b0-3010-0134-741f-00505686a51c | title=
(cartographic)
Northern coast of Long Island Sound from Delancey Point to Calves Island, (1870)
|author=Digital Collections, The New York Public Library |accessdate=September 27, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>