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Spencer Collection, The New York Public Library. "A mechanical well. The top of a well showing a pulley and a loose rope" The New York Public Library Digital Collections. 1540 - 1545. https://digitalcollections.nypl.org/items/399a6860-28ec-0138-c866-6bbd2a82d957
Spencer Collection, The New York Public Library. "A mechanical well. The top of a well showing a pulley and a loose rope" New York Public Library Digital Collections. Accessed May 1, 2024. https://digitalcollections.nypl.org/items/399a6860-28ec-0138-c866-6bbd2a82d957
Spencer Collection, The New York Public Library. (1540 - 1545). A mechanical well. The top of a well showing a pulley and a loose rope Retrieved from https://digitalcollections.nypl.org/items/399a6860-28ec-0138-c866-6bbd2a82d957
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A mechanical well. The top of a well showing a pulley and a loose rope, (1540 - 1545)|author=Digital Collections, The New York Public Library |accessdate=May 1, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>