2004-10-30/2019-10-02 - From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). — With Helmuth Wolff firm of Laval, Québec, Canada, 1972. Sources: Organ Handbook 1980 (Richmond, Va.: Organ Historical Society), 37. Elizabeth Towne Schmitt.
2018-05-07/2019-02-05 - See Main Entry at Hellmuth Wolff & Associés
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