"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MX61-ZPZ : accessed 22 July 2015), Emma Walker in household of John M Walker, Indiana, United States; citing p. 19, family 135, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,854.