"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2F5-8SM : accessed 5 December 2018), Elmer G Crampton, Jefferson, Frederick, Maryland, United States; citing enumeration district (ED) ED 71, sheet 1B, family 10, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 565; FHL microfilm 1,374,578.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNMQ-JMV : accessed 5 December 2018), Elmer Crompton, York Ward 5, York, Pennsylvania, United States; citing ED 123, sheet 8A, line 15, family 177, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1669; FHL microfilm 1,821,669.