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Manuscripts and Archives Division, The New York Public Library. "Harper, J. W. and Harper & Bros" The New York Public Library Digital Collections. 1840 - 1877. http://digitalcollections.nypl.org/items/50049fc0-656b-0133-a52f-00505686a51c
Manuscripts and Archives Division, The New York Public Library. "Harper, J. W. and Harper & Bros" New York Public Library Digital Collections. Accessed December 12, 2019. http://digitalcollections.nypl.org/items/50049fc0-656b-0133-a52f-00505686a51c
Manuscripts and Archives Division, The New York Public Library. (1840 - 1877). Harper, J. W. and Harper & Bros Retrieved from http://digitalcollections.nypl.org/items/50049fc0-656b-0133-a52f-00505686a51c
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