2004-10-30/2019-10-28 - From the OHS PC Database, derived from A Guide to North American Organbuilders by David H. Fox (Organ Historical Society, 1991). — With Joseph Ridges firm of Salt Lake City, Utah, c. 1860s. Source: Barbara Owen.
2015-10-15/2020-04-09 - See main entry: Joseph Ridges
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