2004-10-30/2019-04-11 - From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). — Born in New Ulm, Minnesota; brother of Robert M. Sperling; with Wicks Organ Co. of Highland, Illinois, 1957, tonal director; active in 1989. Source: The American Organist, February 1989 (New York: American Guild of Organists), 58.
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