Bone, R. Gehlmann. (1957). The Gehlmann family in America: a history of E.F. Gehlman, pioneer contractor and architect of Sangamon County, Illinois, his ancestors, descendants, and ... families who married into the Gehlmann family .... [Normal, Ill.]: Bone.MLA Citation
Bone, Robert Gehlmann, 1906-. The Gehlmann Family In America: a History of E.F. Gehlman, Pioneer Contractor And Architect of Sangamon County, Illinois, His Ancestors, Descendants, And ... Families Who Married Into the Gehlmann Family .... [Normal, Ill.]: Bone, 1957.
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