"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X4HP-GTX : accessed 16 May 2021), Marry E Huffman in household of Kelley Huffman, Perry, Muskingum, Ohio, United States; citing enumeration district (ED) ED 25, sheet 9A, line 8, family 206, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1858; FHL microfilm 2,341,592.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KWL3-SGG : 9 January 2021), Mary Huffman in household of Kelley Huffman, Perry Township, Muskingum, Ohio, United States; citing enumeration district (ED) 60-27, sheet 5B, line 51, family 109, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 3122.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:J2NG-GYM : 8 January 2021), Mary Huffman, Jan 1971; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
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