"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MN3F-91L : 12 April 2016), Ervin R Morgan in household of James Morgan, Maryland, United States; citing p. 6, family 42, NARA microfilm publication M593 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 552,086.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MNQ2-1FG : 8 September 2017), Irving R Morgan in household of J W Morgan, Catoctin, Frederick, Maryland, United States; citing enumeration district ED 77, sheet 240B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0510; FHL microfilm 1,254,510.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M327-SFV : accessed 10 September 2017), Irving R Morgan, Election District 6, Catoctin, Frederick, Maryland, United States; citing enumeration district (ED) 14, sheet 6A, family 110, 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:M2F5-WL9 : accessed 10 September 2017), Irving R Morgan, Catoctin, Frederick, Maryland, United States; citing enumeration district (ED) ED 61, sheet 2B, family 35, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 564; FHL microfilm 1,374,577.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M6QL-2PM : accessed 10 September 2017), Irving Morgan, Catoctin, Frederick, Maryland, United States; citing ED 70, sheet 11A, line 4, family 216, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 672; FHL microfilm 1,820,672.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X34V-WSP : accessed 10 September 2017), Irvin R Morgan, Catoctin, Frederick, Maryland, United States; citing enumeration district (ED) ED 23, sheet 9B, line 87, family 173, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 874; FHL microfilm 2,340,609.
Obituary in The Frederick Post (Frederick, Maryland), Thursday, January 12, 1933. Transcribed at Find A Grave Memorial# 101238105