"United States Census, 1880," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MZ1Y-MXV : 14 January 2022), Charles in household of Charles T. Collins, Cleveland, Cuyahoga, Ohio, United States; citing enumeration district , sheet , NARA microfilm publication T9 (Washington, D.C.: National Archives and Records Administration, n.d.), FHL microfilm .
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M2VG-HXV : accessed 16 October 2022), Charles Collens, Newton Ward 5, Middlesex, Massachusetts, United States; citing enumeration district (ED) ED 971, sheet 7A, family 123, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 603; FHL microfilm 1,374,616.
"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XQPV-FRT : accessed 16 October 2022), Charles Collins, Newton, Middlesex, Massachusetts, United States; citing enumeration district (ED) ED 383, sheet 20A, line 8, family 421, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 926; FHL microfilm 2,340,661.
"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:K4FR-WZR : 10 January 2021), Charles Collens, Newton, Middlesex, Massachusetts, United States; citing enumeration district (ED) 9-438, sheet 2B, line 75, family 34, 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 1615.
Find a Grave, database and images (https://www.findagrave.com/memorial/67736511/charles-collens: accessed 16 October 2022), memorial page for Charles Collens (14 Oct 1873–18 Sep 1956), Find A Grave: Memorial #67736511, citing Cedar Hill Cemetery, Hartford, Hartford County, Connecticut, USA; Maintained by C Greer (contributor 47180683) .
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