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Manuscripts and Archives Division, The New York Public Library. "Halley, C.A" The New York Public Library Digital Collections. 1886. https://digitalcollections.nypl.org/items/d2cf6ee0-2dda-0135-9979-4f5becdb2012
Manuscripts and Archives Division, The New York Public Library. "Halley, C.A" New York Public Library Digital Collections. Accessed May 14, 2024. https://digitalcollections.nypl.org/items/d2cf6ee0-2dda-0135-9979-4f5becdb2012
Manuscripts and Archives Division, The New York Public Library. (1886). Halley, C.A Retrieved from https://digitalcollections.nypl.org/items/d2cf6ee0-2dda-0135-9979-4f5becdb2012
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/d2cf6ee0-2dda-0135-9979-4f5becdb2012 | title=
(text)
Halley, C.A, (1886)|author=Digital Collections, The New York Public Library |accessdate=May 14, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>