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General Research Division, The New York Public Library. "Scientific American" The New York Public Library Digital Collections. 1917-07-28. https://digitalcollections.nypl.org/items/4e9d43c0-326b-0130-cc7d-58d385a7b928
General Research Division, The New York Public Library. "Scientific American" New York Public Library Digital Collections. Accessed December 6, 2024. https://digitalcollections.nypl.org/items/4e9d43c0-326b-0130-cc7d-58d385a7b928
General Research Division, The New York Public Library. (1917-07-28). Scientific American Retrieved from https://digitalcollections.nypl.org/items/4e9d43c0-326b-0130-cc7d-58d385a7b928
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Scientific American, (1917-07-28)
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