2004-10-30/2019-10-05 - From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991). — With Wolff firm of Laval, Québec, Canada, 1989. Source: The American Organist July 1989, 42.
2015-10-25/2019-02-05 - See main entry: Hellmuth Wolff & Associés
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