"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MN9B-P6J : 12 April 2016), Olive A Calkins in household of Nelson Calkins, Wisconsin, United States; citing p. 1, family 7, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 553,228.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNHW-8DN : 13 August 2016), Olive H Calkins in household of Nelson Calkins, La Grange, Monroe, Wisconsin, United States; citing enumeration district ED 26, sheet 50B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 1439; FHL microfilm 1,255,439.