"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2LK-51F : accessed 18 March 2016), Richard W Aldridge in household of William J Aldridge, McKinley, Cass, Minnesota, United States; citing enumeration district (ED) ED 12, sheet 1B, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,706.
"United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K87D-L35 : accessed 18 March 2016), Richard W Aldridge, 1917-1918; citing Cass County, Minnesota, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,675,386.