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From Krofdorf to Keystone
出版Hansen, 1977
URLhttp://books.google.com.hk/books?id=_VtVAAAAMAAJ&hl=&source=gbs_api
註釋Ludwig Heyer was born in 1818 at Krofdorf, Hesse, Germany and married Margaretha Pfeifer in 1845. They immigrated after 1862 to Big Grove Township, Benton County, Iowa, and he died in 1904.