"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNQ2-XM5 : 15 August 2017), Elmer E Dixon in household of Thomas O Dixon, Frederick, Frederick, Maryland, United States; citing enumeration district ED 67, sheet 47A, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0509; FHL microfilm 1,254,509.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M32Q-89K : accessed 22 April 2018), Elmer E Dixon, Frederick city (south, west part), Frederick, Maryland, United States; citing enumeration district (ED) 8, sheet 1A, family 1, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,622.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2FP-2ZY : accessed 22 April 2018), Elmer E Dixon, Frederick, Frederick, Maryland, United States; citing enumeration district (ED) ED 52, sheet 11A, family 247, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 564; FHL microfilm 1,374,577.
Find A Grave, database and images (https://www.findagrave.com : accessed 21 April 2018), memorial page for Elmer E. Dixon (21 May 1876–5 May 1958), Find A Grave Memorial no. 155713487, citing Mount Olivet Cemetery, Frederick, Frederick County, Maryland, USA ; Maintained by Mike Hahn (contributor 46770538) .