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Manuscripts and Archives Division, The New York Public Library. "25c dark green Parcel Post Postage Due block of six" The New York Public Library Digital Collections. 1913. https://digitalcollections.nypl.org/items/5e66b3e8-b837-d471-e040-e00a180654d7
Manuscripts and Archives Division, The New York Public Library. "25c dark green Parcel Post Postage Due block of six" New York Public Library Digital Collections. Accessed March 28, 2024. https://digitalcollections.nypl.org/items/5e66b3e8-b837-d471-e040-e00a180654d7
Manuscripts and Archives Division, The New York Public Library. (1913). 25c dark green Parcel Post Postage Due block of six Retrieved from https://digitalcollections.nypl.org/items/5e66b3e8-b837-d471-e040-e00a180654d7
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/5e66b3e8-b837-d471-e040-e00a180654d7 | title=
(still image)
25c dark green Parcel Post Postage Due block of six, (1913)
|author=Digital Collections, The New York Public Library |accessdate=March 28, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>