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Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Piscataqua Harbour, Portsmouth, York Harbour, &c." The New York Public Library Digital Collections. 1779. https://old-digitalcollections.nypl.org/items/a7fcc3e0-a2b8-0134-c489-00505686a51c
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. "Piscataqua Harbour, Portsmouth, York Harbour, &c." New York Public Library Digital Collections. Accessed October 9, 2026. https://old-digitalcollections.nypl.org/items/a7fcc3e0-a2b8-0134-c489-00505686a51c
Lionel Pincus and Princess Firyal Map Division, The New York Public Library. (1779). Piscataqua Harbour, Portsmouth, York Harbour, &c. Retrieved from https://old-digitalcollections.nypl.org/items/a7fcc3e0-a2b8-0134-c489-00505686a51c
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/a7fcc3e0-a2b8-0134-c489-00505686a51c | title=
(cartographic)
Piscataqua Harbour, Portsmouth, York Harbour, &c., (1779)
|author=Digital Collections, The New York Public Library |accessdate=October 9, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>