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Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. "Lake Ronkonkoma, Long Island's largest geologic kettle" The New York Public Library Digital Collections. 1862 - 1963. https://qa-digitalcollections.nypl.org/items/510d47e4-8410-a3d9-e040-e00a18064a99
Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. "Lake Ronkonkoma, Long Island's largest geologic kettle" New York Public Library Digital Collections. Accessed November 22, 2024. https://qa-digitalcollections.nypl.org/items/510d47e4-8410-a3d9-e040-e00a18064a99
Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. (1862 - 1963). Lake Ronkonkoma, Long Island's largest geologic kettle Retrieved from https://qa-digitalcollections.nypl.org/items/510d47e4-8410-a3d9-e040-e00a18064a99
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(still image)
Lake Ronkonkoma, Long Island's largest geologic kettle, (1862 - 1963)|author=Digital Collections, The New York Public Library |accessdate=November 22, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>