Ancestry.com and The Church of Jesus Christ of Latter-day Saints. 1880 United States Federal Census [database on-line]. Lehi, UT, USA: Ancestry.com Operations Inc, 2010. Year: 1880; Census Place: Grant, Clark, Missouri; Roll: 681; Page: 228C; Enumeration District: 043.
Ancestry.com. 1900 United States Federal Census [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2004. Year: 1900; Census Place: Grant, Clark, Missouri; Page: 4; Enumeration District: 0021; FHL microfilm: 1240848.
Find a Grave, database and images (https://www.findagrave.com/memorial/13677918/robert-price-gray : accessed ), memorial page for Robert Price Gray (27 Feb 1823–2 Feb 1906), Find a Grave Memorial ID 13677918, citing Athens Cemetery, Athens, Clark County, Missouri, USA ; Maintained by Shawn (contributor 46550807).
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