Ancestry.com. 1900 United States Federal Census [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2004. Year: 1900; Census Place: Quincy, Adams, Iowa; Page: 10; Enumeration District: 0010; FHL microfilm: 1240415
Find a Grave, database and images (https://www.findagrave.com/memorial/91784219/phronia-calkin : accessed 27 August 2021), memorial page for Phronia Wycoff Calkin (30 Jan 1881–8 Jul 1974), Find a Grave Memorial ID 91784219, citing Mountview Cemetery, Billings, Yellowstone County, Montana, USA ; Maintained by RobMinteer57 (contributor 47389024).
Ancestry.com. U.S., Social Security Applications and Claims Index, 1936-2007 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2015.
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