Collections : [University of Michigan Bentley Historical Library]

Ann Arbor German-American family, owners of the Allmendinger Organ Company which later became the Ann Arbor Organ Company. Correspondence, scrapbooks, family genealogy, photographs concerning family affairs, materials on Helene Allmendinger's radio show, examples of spirit messages received by Helene Allmendinger from deceased family members; information pertaining to the Ann Arbor Organ Company, and family members still living in Germany.

The collection is divided into the following series: Family records and correspondence; Helene Allmendinger papers; Ina Allmendinger papers; Ann Arbor Organ Company; Harriet Birch papers, Other family members; Miscellaneous, and Photographs.

Local historical society for Washtenaw County, Michigan Organizational records and collected historical materials.

The Washtenaw County Historical Society records include collected historical documents and photographs relating to the people, events, and history of the county, its cities and townships. There are also administrative records of the organization, including minutes of meetings, subjects relating to Society programs and projects, and financial miscellanea.