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Manuscripts and Archives Division, The New York Public Library. "Envelope sent by P.W. Costello to Penman's Art Journal" The New York Public Library Digital Collections. 1905-10-30. https://digitalcollections.nypl.org/items/a7d0e925-f8e7-eff6-e040-e00a18060357
Manuscripts and Archives Division, The New York Public Library. "Envelope sent by P.W. Costello to Penman's Art Journal" New York Public Library Digital Collections. Accessed January 28, 2025. https://digitalcollections.nypl.org/items/a7d0e925-f8e7-eff6-e040-e00a18060357
Manuscripts and Archives Division, The New York Public Library. (1905-10-30). Envelope sent by P.W. Costello to Penman's Art Journal Retrieved from https://digitalcollections.nypl.org/items/a7d0e925-f8e7-eff6-e040-e00a18060357
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/a7d0e925-f8e7-eff6-e040-e00a18060357 | title=
(still image)
Envelope sent by P.W. Costello to Penman's Art Journal, (1905-10-30)
|author=Digital Collections, The New York Public Library |accessdate=January 28, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>