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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.

Administrative files, conference proceedings, project proposals, research files, records, and photographs relating to continuing education conferences and workshops.

The records of the Institute consist of forty-nine linear feet of manuscripts and printed materials. The records date form 1965 to 1983. The record group is divided into four broad Series: Administrative Files (boxes 1-7), Research Files (boxes 8-18), Continuing Education (boxes 19-48), and Photographs (box 49). Of these, only the Administrative Files have been closely processed. The Administration Files are divided into several subseries, the most substantive of which are History of ISMRRD, Committees, Institute Reviews, and Projects, Proposals and Reports.