"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MN2N-Y73 : accessed 30 May 2016), Marvin Knapp in household of John R Knapp, Clark, Harrison, West Virginia, United States; citing sheet 28B, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,821,955.
"United States Census, 1930", database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XM4G-RNF : accessed 30 May 2016), Marvin Knapp in entry for Roy J Knapp, 1930.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/K7CZ-C9L : accessed 30 May 2016), Marvin Knapp in household of John R Knapp, Clark Magisterial District, Harrison, West Virginia, United States; citing enumeration district (ED) 17-34, sheet 2A, family 21, NARA digital publication T627 (Washington, D.C.: National Archives and Records Administration, 2012), roll 4408.
"West Virginia Deaths, 1804-1999," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/F1GZ-DY7 : accessed 30 May 2016), Marvin L Knapp, 06 Apr 1959; citing Clarksburg, Harrison Co, West Virginia, County Records, v 21 p 139A, county courthouses, West Virginia; FHL microfilm 847,178.
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