"United States Census, 1870," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MN9L-836 : accessed 24 January 2015), Martha Grasma in household of Bauker Grasma, Wisconsin, United States; citing p. 17, family 115, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 553,220.