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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Keppler's Cascades, from above" The New York Public Library Digital Collections. 1885 - 1890. https://old-digitalcollections.nypl.org/items/02a6ada0-964e-0135-c247-3d352e32477f
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. "Keppler's Cascades, from above" New York Public Library Digital Collections. Accessed November 3, 2026. https://old-digitalcollections.nypl.org/items/02a6ada0-964e-0135-c247-3d352e32477f
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Photography Collection, The New York Public Library. (1885 - 1890). Keppler's Cascades, from above Retrieved from https://old-digitalcollections.nypl.org/items/02a6ada0-964e-0135-c247-3d352e32477f
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