| Sources  | 
- [S77]  U.S., World War I Draft Registration Cards, 1917-1918, Ancestry.com, (Name: Ancestry.com Operations Inc; Location: Provo, UT, USA; Date: 2005;), Database online. Registration Location: Clay County, Missouri; Roll: 1683161; Draft Board: 0.
 
Record for William Walter Marr 
 
  
- [S1039]  U.S., Social Security Death Index, 1935-2014, Ancestry.com, (Name: Ancestry.com Operations Inc; Location: Provo, UT, USA; Date: 2011;), Database online. Number: 487-03-8941; Issue State: Missouri; Issue Date: Before 1951.
 
Record for William Marr 
  
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