"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZ91-YQL : 19 February 2021), George W Bollman in household of Swan Bollman, Stockholm, Wright, Minnesota, United States; citing enumeration district ED 72, sheet 461B, NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm 1,254,638.
"United States World War II Draft Registration Cards, 1942," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKCH-YK3T : 10 March 2021), George Walter Bollman, 27 Apr 1942; citing NARA microfilm publication M1936, M1937, M1939, M1951, M1962, M1964, M1986, M2090, and M2097 (Washington D.C.: National Archives and Records Administration, n.d.).
"Minnesota Deaths, 1887-2001," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:HT6X-5C2M : 8 April 2020), George Walter Bollman, 1 Mar 1951; citing Death, Minnesota State Department of Health, St. Paul.