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Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. "Loft building: Sonntag & Beggs Musical Instruments; American Mutual Life; Washington Insurance Co." The New York Public Library Digital Collections. 1870. https://old-digitalcollections.nypl.org/items/e16655b0-8a0c-0132-0048-58d385a7bbd0
Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. "Loft building: Sonntag & Beggs Musical Instruments; American Mutual Life; Washington Insurance Co." New York Public Library Digital Collections. Accessed October 8, 2026. https://old-digitalcollections.nypl.org/items/e16655b0-8a0c-0132-0048-58d385a7bbd0
Irma and Paul Milstein Division of United States History, Local History and Genealogy, The New York Public Library. (1870). Loft building: Sonntag & Beggs Musical Instruments; American Mutual Life; Washington Insurance Co. Retrieved from https://old-digitalcollections.nypl.org/items/e16655b0-8a0c-0132-0048-58d385a7bbd0
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