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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "The Army of the Potomac. Looking up Pennsylvania Avenue from the Treasury buildings, Maj. Gen. Humphrey and staff, and 2d Army Corps passing in review." The New York Public Library Digital Collections. 1861 - 1865. https://digitalcollections.nypl.org/items/510d47e2-5b1d-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "The Army of the Potomac. Looking up Pennsylvania Avenue from the Treasury buildings, Maj. Gen. Humphrey and staff, and 2d Army Corps passing in review." New York Public Library Digital Collections. Accessed January 16, 2025. https://digitalcollections.nypl.org/items/510d47e2-5b1d-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1861 - 1865). The Army of the Potomac. Looking up Pennsylvania Avenue from the Treasury buildings, Maj. Gen. Humphrey and staff, and 2d Army Corps passing in review. Retrieved from https://digitalcollections.nypl.org/items/510d47e2-5b1d-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/510d47e2-5b1d-a3d9-e040-e00a18064a99 | title=
(still image)
The Army of the Potomac. Looking up Pennsylvania Avenue from the Treasury buildings, Maj. Gen. Humphrey and staff, and 2d Army Corps passing in review., (1861 - 1865)|author=Digital Collections, The New York Public Library |accessdate=January 16, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>