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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Harbor boat service, New York. Handling mail by container unit system, Pier 72, N. R." The New York Public Library Digital Collections. 1860 - 1920. https://old-digitalcollections.nypl.org/items/510d47d9-b7fa-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Harbor boat service, New York. Handling mail by container unit system, Pier 72, N. R." New York Public Library Digital Collections. Accessed October 11, 2026. https://old-digitalcollections.nypl.org/items/510d47d9-b7fa-a3d9-e040-e00a18064a99
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1860 - 1920). Harbor boat service, New York. Handling mail by container unit system, Pier 72, N. R. Retrieved from https://old-digitalcollections.nypl.org/items/510d47d9-b7fa-a3d9-e040-e00a18064a99
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/510d47d9-b7fa-a3d9-e040-e00a18064a99 | title=
(still image)
Harbor boat service, New York. Handling mail by container unit system, Pier 72, N. R., (1860 - 1920)
|author=Digital Collections, The New York Public Library |accessdate=October 11, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>