"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MFK6-P9X : accessed 3 September 2020), Albert P Grass in household of Peter Grass, Sumpter, Sauk, Wisconsin, United States; citing ED 179, sheet 1B, line 54, family 13, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 2015; FHL microfilm 1,822,015.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K7V3-KHS : 10 February 2020), Albert Grass in household of Peter Grass, Leland, Honey Creek Town, Sauk, Wisconsin, United States; citing enumeration district (ED) 56-17, sheet 8B, line 69, family 149, 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 4523.
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