"United States Census, 1900," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M92M-B9M : accessed 25 January 2015), John Laskewitz, Richland Township, Jasper, Iowa, United States; citing sheet 1A, family 7, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,240,439.