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The Keystone; a journal devoted to the interests of the jewelry and optical trades.
General Research Division, The New York Public Library. "Announcement for 1917 - Our New Period Patterns" The New York Public Library Digital Collections. 1895 - 1934. https://digitalcollections.nypl.org/items/8d2c5767-5236-f6f5-e040-e00a18063932
General Research Division, The New York Public Library. "Announcement for 1917 - Our New Period Patterns" New York Public Library Digital Collections. Accessed January 15, 2025. https://digitalcollections.nypl.org/items/8d2c5767-5236-f6f5-e040-e00a18063932
General Research Division, The New York Public Library. (1895 - 1934). Announcement for 1917 - Our New Period Patterns Retrieved from https://digitalcollections.nypl.org/items/8d2c5767-5236-f6f5-e040-e00a18063932
<ref name=NYPL>{{cite web | url=https://digitalcollections.nypl.org/items/8d2c5767-5236-f6f5-e040-e00a18063932 | title=
(still image)
Announcement for 1917 - Our New Period Patterns, (1895 - 1934)
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