"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M3CF-238 : accessed 23 November 2017), William A J Hartley in household of Labroe Hartley, Finley Township, Douglas, Missouri, United States; citing enumeration district (ED) 163, sheet 13B, family 234, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,853.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M2TX-J94 : accessed 23 November 2017), William Hartley in household of Henderson Gentry, Findley, Douglas, Missouri, United States; citing enumeration district (ED) ED 58, sheet 10B, family 123, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 773; FHL microfilm 1,374,786.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M88K-YVN : accessed 23 November 2017), William Hartley in household of Joseph Hartley, Pleasant Valley, Wright, Missouri, United States; citing ED 153, sheet 3A, line 44, family 41, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 966; FHL microfilm 1,820,966.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JGM7-YJ4 : 11 January 2021), William Hartley, Oct 1973; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
Find A Grave, database and images (https://www.findagrave.com : accessed 03 December 2018), memorial page for William Andrew “Bill” Hartley (27 Oct 1881–10 Oct 1973), Find A Grave Memorial no. 29352239, citing Prosser Cemetery, Prosser, Benton County, Washington, USA ; Maintained by Gene Funk (contributor 47995499) . Find A Grave: Memorial #29352239
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