"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MGVS-YQW : accessed 30 May 2017), Joseph Dugan in household of Gabrial Dugan, Chehalis, Lewis, Washington, United States; citing enumeration district (ED) ED 136, sheet 16B, family 290, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1666; FHL microfilm 1,375,679.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K9S3-N1Z : accessed 30 May 2017), Blanch Dugan in household of Joseph Dugan, Ward West 1, Chehalis, Chehalis Election Precinct, Lewis, Washington, United States; citing enumeration district (ED) 21-28, sheet 3B, line 61, family 67, 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 4350.
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