"United States Census, 1870," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6CM-M7N : accessed 15 June 2015), Peter Olson, Rock Island, Illinois, United States; citing p. 41, family 294, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 545,772.
"United States Census, 1900," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MSHZ-933 : accessed 15 June 2015), Peter Olsen, Rock Island Township, Election Precinct 2 Rock Island city Ward 5, Rock Island, Illinois, United States; citing sheet 10A, family 220, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,240,339.
"United States Census, 1910," index and images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MKXD-WX9 : accessed 15 June 2015), Peter Olson, Rock Island Ward 5, Rock Island, Illinois, United States; citing enumeration district (ED) 121, sheet 10A, family 230, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,334.
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