2004-10-30/2019-10-23 - From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). — Son of Johann G. Pfeffer, brother of George, Robert, and Eugene Pfeffer; with family firm J.G. Pfeffer & Son in St. Louis, Missouri, (1890s-1909?). Source: Organ Handbook 1986 (Richmond, Va.: Organ Historical Society), 19.
2015-10-09/2020-04-09 - See main entry: J.G. Pfeffer & Son
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