2004-10-30/2019-09-27 - Note from the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Organ Historical Society, 1991). — Andres Hermann worked with Hellmuth Wolff of Laval, Québec, Canada, 1972. Sources: Organ Handbook (Organ Historical Society, 1980), 37. Elizabeth Towne Schmitt.
2015-09-23/2020-04-09 - See main entry: Hellmuth Wolff
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