Ancestry.com: Various records, including public trees
Certificate of Marriage, Louis A. Barkus and Edith L. Bushnell, 1920
Chantry, F. R., Obituary for Louis A. Barkus, 1944.
Death Certificate: Edith L. Barkus
Iowa State Census, 1925.
Jones, B Lou. Never Lead from a King. 2000.
Malvern Schools' materials
Malvern Leader articles
Mills County Tribune
Obituaries: Louis A Barkus; Edith Bushnell
Paddock, John. A Brief History of Malvern. 1917.
Personal collection of photographs, memorabilia
Personal recollections of relatives
Promotion Certificate, Malvern Public Schools
US Federal Census: 1900, 1910, 1920, 1930, 1940
US Marine Corps materials: Enlistment; Promotion; Discharge; Regimental history
Wikipedia: Bushnell name; Malvern history; Chillicothe Business College
World War I, Registration cards
Worman, Allen. Letter to Maynard Jones, 19 March 1979