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General Research Division, The New York Public Library. "Ruling machine" The New York Public Library Digital Collections. 1875. https://digitalcollections.nypl.org/items/7de50150-c900-0137-6c78-71e43a14f397
General Research Division, The New York Public Library. "Ruling machine" New York Public Library Digital Collections. Accessed April 28, 2024. https://digitalcollections.nypl.org/items/7de50150-c900-0137-6c78-71e43a14f397
General Research Division, The New York Public Library. (1875). Ruling machine Retrieved from https://digitalcollections.nypl.org/items/7de50150-c900-0137-6c78-71e43a14f397
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/7de50150-c900-0137-6c78-71e43a14f397 | title=
(still image)
Ruling machine, (1875)
|author=Digital Collections, The New York Public Library |accessdate=April 28, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>