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Carl H. Pforzheimer Collection of Shelley and His Circle: visual materials
Carl H. Pforzheimer Collection of Shelley and His Circle, The New York Public Library. "Mulready's penny post envelope" The New York Public Library Digital Collections. 1839. https://digitalcollections.nypl.org/items/5e66b3e8-dff0-d471-e040-e00a180654d7
Carl H. Pforzheimer Collection of Shelley and His Circle, The New York Public Library. "Mulready's penny post envelope" New York Public Library Digital Collections. Accessed February 6, 2025. https://digitalcollections.nypl.org/items/5e66b3e8-dff0-d471-e040-e00a180654d7
Carl H. Pforzheimer Collection of Shelley and His Circle, The New York Public Library. (1839). Mulready's penny post envelope Retrieved from https://digitalcollections.nypl.org/items/5e66b3e8-dff0-d471-e040-e00a180654d7
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/5e66b3e8-dff0-d471-e040-e00a180654d7 | title=
(still image)
Mulready's penny post envelope, (1839)
|author=Digital Collections, The New York Public Library |accessdate=February 6, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>