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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. "George Sand en Madeleine. Dessin à la plume de Louis Boulanger (1807-1867)." The New York Public Library Digital Collections. 1800 - 1910. https://digitalcollections.nypl.org/items/a14c5632-8be4-01c2-e040-e00a18062585
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. "George Sand en Madeleine. Dessin à la plume de Louis Boulanger (1807-1867)." New York Public Library Digital Collections. Accessed July 13, 2025. https://digitalcollections.nypl.org/items/a14c5632-8be4-01c2-e040-e00a18062585
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. (1800 - 1910). George Sand en Madeleine. Dessin à la plume de Louis Boulanger (1807-1867). Retrieved from https://digitalcollections.nypl.org/items/a14c5632-8be4-01c2-e040-e00a18062585
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/a14c5632-8be4-01c2-e040-e00a18062585 | title=
(still image)
George Sand en Madeleine. Dessin à la plume de Louis Boulanger (1807-1867)., (1800 - 1910)
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