"Iowa State Census, 1895," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VT39-ZL3 : 10 March 2018), Mary Slagle in household of E V Slagle, Fremont, Iowa, United States; citing p. 15, 1895, State Historical Society, Des Moines; FHL microfilm 1,020,353.
"United States Census, 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MMTF-XCK : accessed 22 December 2018), Marg F Slagle in household of Albert Eskridge, Washington Township (east part) Elwood & Wathena cities, Doniphan, Kansas, United States; citing enumeration district (ED) 44, sheet 20B, family 445, NARA microfilm publication T623 (Washington, D.C.: National Archives and Records Administration, 1972.); FHL microfilm 1,240,478.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MGJ8-RFZ : accessed 22 December 2018), Mary F Knowlton in household of James H Knowlton, Pateros, Okanogan, Washington, United States; citing enumeration district (ED) ED 124, sheet 6B, family 153, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1667; FHL microfilm 1,375,680.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHFK-SWZ : accessed 22 December 2018), Mary F Knowlton in household of James H Knowlton, Bodie, Okanogan, Washington, United States; citing ED 81, sheet 7A, line 23, family 182, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1934; FHL microfilm 1,821,934.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XC3G-32C : accessed 22 December 2018), Mary F Knowlton in household of James H Knowlton, Brewster, Okanogan, Washington, United States; citing enumeration district (ED) ED 7, sheet 2B, line 84, family 46, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 2508; FHL microfilm 2,342,242.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K9SQ-SC6 : 15 March 2018), Mary F Knowlton in household of James H Knowlton, Brewster Election Precinct, Okanogan, Washington, United States; citing enumeration district (ED) 24-7, sheet 1B, line 59, family 18, 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 4353.
"United States Social Security Death Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:V3KX-TJM : 19 May 2014), Mary Knowlton, Nov 1981; citing U.S. Social Security Administration, Death Master File, database (Alexandria, Virginia: National Technical Information Service, ongoing).
"Find A Grave Index," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVKJ-S2B2 : 11 July 2016), Mary Frances Slagle Knowlton, 1981; Burial, Brewster, Okanogan, Washington, United States of America, Locust Grove Cemetery; citing record ID 41835244, Find a Grave, http://www.findagrave.com.
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