Family tree▼
"Iowa, County Births, 1880-1935," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KHT9-JPZ : accessed 14 Sep 2013), Frederick Kramer in entry for Martin Kramer, 1925.
"United States Social Security Death Index," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/JGTD-S47 : accessed 14 Sep 2013), Martin Kramer, 8 January 2010.