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Spencer Collection, The New York Public Library. "Front doubleur" The New York Public Library Digital Collections. 1909 - 1899. http://digitalcollections.nypl.org/items/510d47dc-401b-a3d9-e040-e00a18064a99
Spencer Collection, The New York Public Library. "Front doubleur" New York Public Library Digital Collections. Accessed April 20, 2018. http://digitalcollections.nypl.org/items/510d47dc-401b-a3d9-e040-e00a18064a99
Spencer Collection, The New York Public Library. (1909 - 1899). Front doubleur Retrieved from http://digitalcollections.nypl.org/items/510d47dc-401b-a3d9-e040-e00a18064a99
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Front doubleur, (1909 - 1899) }}
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