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Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. "Great Onyx Cave, helectites" The New York Public Library Digital Collections. 1862 - 1963. https://qa-digitalcollections.nypl.org/items/510d47e4-16bd-a3d9-e040-e00a18064a99
Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. "Great Onyx Cave, helectites" New York Public Library Digital Collections. Accessed November 22, 2024. https://qa-digitalcollections.nypl.org/items/510d47e4-16bd-a3d9-e040-e00a18064a99
Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. (1862 - 1963). Great Onyx Cave, helectites Retrieved from https://qa-digitalcollections.nypl.org/items/510d47e4-16bd-a3d9-e040-e00a18064a99
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