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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Picture Collection, The New York Public Library. "The great meeting in Union Square, New York, to support the government, April 20, 1861" The New York Public Library Digital Collections. 1861-05-04. https://qa-digitalcollections.nypl.org/items/510d47e0-ccde-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Picture Collection, The New York Public Library. "The great meeting in Union Square, New York, to support the government, April 20, 1861" New York Public Library Digital Collections. Accessed November 22, 2024. https://qa-digitalcollections.nypl.org/items/510d47e0-ccde-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Picture Collection, The New York Public Library. (1861-05-04). The great meeting in Union Square, New York, to support the government, April 20, 1861 Retrieved from https://qa-digitalcollections.nypl.org/items/510d47e0-ccde-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/510d47e0-ccde-a3d9-e040-e00a18064a99 | title=
(still image)
The great meeting in Union Square, New York, to support the government, April 20, 1861, (1861-05-04)
|author=Digital Collections, The New York Public Library |accessdate=November 22, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>