Ancestry.com. Kansas, U.S., State Census Collection, 1855-1925 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2009. Kansas State Historical Society; Topeka, Kansas; Roll: ks1915_137; Line: 7.
Montana State Genealogical Society and Ancestry.com. Montana Death Index, 1907-2007 [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2009.
Ancestry.com. Montana, U.S., State Deaths, 1907-2018 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2001. State of Montana, Montana State Deaths, 1868-2018, State of Montana Department of Public Health and Human Services, Office of Vital Statistics, Helena, Montana.
Ancestry.com. Montana, U.S., County Marriage Records, 1865-1993 [database on-line]. Lehi, UT, USA: Ancestry.com Operations, Inc., 2016. Verifies marriage to Martha Graf on 18 Jul 1923 in Fallon, Prairie, Montana.
Ancestry.com. South Dakota, U.S., State Census, 1905 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2014.
Ancestry.com. U.S., City Directories, 1822-1995 [database on-line]. Lehi, UT, USA: Ancestry.com Operations, Inc., 2011. Billings, Montana, City Directory.
The National Archives At St. Louis; St. Louis, Missouri; World War Ii Draft Cards (Fourth Registration) For the State of Montana; Record Group Title: Records of the Selective Service System; Record Group Number: 147; Box or Roll Number: 1.
Find a Grave, database and images (https://www.findagrave.com/memorial/91782894/frederick-becker : accessed 9 December 2021), memorial page for Frederick Becker (5 Feb 1892–28 Jan 1948), Find a Grave Memorial ID 91782894, citing Mountview Cemetery, Billings, Yellowstone County, Montana, USA ; Maintained by RobMinteer57 (contributor 47389024).
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