2004-10-30/2019-04-29 - From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). - With Pfeffer firm of St. Louis, Missouri, 1905, partner. Sources: Organ Handbook (Richmond, Va.: Organ Historical Society, 1986), 19. Donald T. Petering: John George Pfeffer, St. Louis Organbuilder, master-s thesis, Concordia College, River Forest, Illinois, 1979
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