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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Art & Architecture Collection, The New York Public Library. "Echelle et angle de proportions; Echelle triangulaire pour les conversions au mètre de toutes les mesures de longuer." The New York Public Library Digital Collections. 1859. https://qa-digitalcollections.nypl.org/items/939cbbc9-1098-fdba-e040-e00a180613de
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Art & Architecture Collection, The New York Public Library. "Echelle et angle de proportions; Echelle triangulaire pour les conversions au mètre de toutes les mesures de longuer." New York Public Library Digital Collections. Accessed November 22, 2024. https://qa-digitalcollections.nypl.org/items/939cbbc9-1098-fdba-e040-e00a180613de
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Art & Architecture Collection, The New York Public Library. (1859). Echelle et angle de proportions; Echelle triangulaire pour les conversions au mètre de toutes les mesures de longuer. Retrieved from https://qa-digitalcollections.nypl.org/items/939cbbc9-1098-fdba-e040-e00a180613de
<ref name=NYPL>{{cite web | url=https://qa-digitalcollections.nypl.org/items/939cbbc9-1098-fdba-e040-e00a180613de | title=
(still image)
Echelle et angle de proportions; Echelle triangulaire pour les conversions au mètre de toutes les mesures de longuer., (1859)
|author=Digital Collections, The New York Public Library |accessdate=November 22, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>