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Manuscripts and Archives Division, The New York Public Library. "Three problems with only black pieces shown on charts" The New York Public Library Digital Collections. 1424. https://qa-digitalcollections.nypl.org/items/510d47da-e8be-a3d9-e040-e00a18064a99
Manuscripts and Archives Division, The New York Public Library. "Three problems with only black pieces shown on charts" New York Public Library Digital Collections. Accessed November 23, 2024. https://qa-digitalcollections.nypl.org/items/510d47da-e8be-a3d9-e040-e00a18064a99
Manuscripts and Archives Division, The New York Public Library. (1424). Three problems with only black pieces shown on charts Retrieved from https://qa-digitalcollections.nypl.org/items/510d47da-e8be-a3d9-e040-e00a18064a99
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