2004-10-30/2019-10-26 - From the OHS PC Database, (James H. Cook and Elizabeth Towne Schmitt, co-editors). — Music store in St. Mary's, Ohio, operated by Henry Holtkamp. Name appears on Salix, Iowa organ built by Votteler-Hettche Co. Source: The source was not listed, but appears to be from the entry for Henry Holtkamp in A Guide to North American Organbuilders, by David H. Fox (Richmond, Va.: Organ Historical Society, 1991).
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