"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/KMYY-KG8 : accessed 23 April 2018), Mary Myers in household of Alphons M Myers, Ward 2, Marshalltown, Marshall Township, Marshall, Iowa, United States; citing enumeration district (ED) 64-25, sheet 13A, line 25, family 488, 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 1182.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XMJQ-8TY : accessed 23 April 2018), Mary Myers in household of Alphonso Myers, Julien, Dubuque, Iowa, United States; citing enumeration district (ED) ED 32, sheet 14B, line 51, family 321, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 654; FHL microfilm 2,340,389.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M81G-MMY : accessed 23 April 2018), Mary Myers in household of Alphonso Myers, Marshall Ward 3, Marshall, Iowa, United States; citing ED 164, sheet 2B, line 77, family 56, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 502; FHL microfilm 1,820,502.
"Iowa, County Marriages, 1838-1934," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/VJPN-TPJ : 26 September 2017), A M Myer and Mary Roberts Nichols, 18 Apr 1917, Marshall, Iowa, United States; citing reference , county courthouses, Iowa; FHL microfilm 1,753,298.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MGML-DWG : accessed 23 April 2018), Mary A Nichols in household of Paul Nichols, Marshalltown Ward 1, Marshall, Iowa, United States; citing enumeration district (ED) ED 137, sheet 6B, family 178, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 413; FHL microfilm 1,374,426.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MSSH-FB6 : accessed 23 April 2018), Mary Nichols in household of Paul Nichols, Savanna Township Savanna city Ward 1, 3, Carroll, Illinois, United States; citing enumeration district (ED) 23, sheet 17A, family 379, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,239.
"Iowa, County Marriages, 1838-1934," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XJW6-H3J : 6 November 2017), Paul Nichols and Mary M. Roberts, 06 Mar 1895, Minerva Township, Marshall, Iowa, United States; citing reference 140, county courthouses, Iowa; FHL microfilm 956,739.
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M6XY-VDV : 7 September 2017), Mary Roberts in household of John Roberts, Haw Creek, Morgan, Missouri, United States; citing enumeration district ED 193, sheet 224B, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0705; FHL microfilm 1,254,705.
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