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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. "Experimenting with the rubber pontoons and rope bridge at Camp Alexander, Washington D.C. 15th N.Y.V. Engineers. Col. McLoud Murphy, Annacosta River or Eastern Branch" The New York Public Library Digital Collections. 1861. https://qa-digitalcollections.nypl.org/items/6eaed3cc-757b-1df6-e040-e00a18065bf1
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. "Experimenting with the rubber pontoons and rope bridge at Camp Alexander, Washington D.C. 15th N.Y.V. Engineers. Col. McLoud Murphy, Annacosta River or Eastern Branch" New York Public Library Digital Collections. Accessed November 22, 2024. https://qa-digitalcollections.nypl.org/items/6eaed3cc-757b-1df6-e040-e00a18065bf1
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. (1861). Experimenting with the rubber pontoons and rope bridge at Camp Alexander, Washington D.C. 15th N.Y.V. Engineers. Col. McLoud Murphy, Annacosta River or Eastern Branch Retrieved from https://qa-digitalcollections.nypl.org/items/6eaed3cc-757b-1df6-e040-e00a18065bf1
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/6eaed3cc-757b-1df6-e040-e00a18065bf1 | title=
(still image)
Experimenting with the rubber pontoons and rope bridge at Camp Alexander, Washington D.C. 15th N.Y.V. Engineers. Col. McLoud Murphy, Annacosta River or Eastern Branch, (1861)|author=Digital Collections, The New York Public Library |accessdate=November 22, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>