"United States Census, 1920", database with images, FamilySearch (ark:/61903/1:1:M4Z1-LV8 : Wed Apr 05 09:21:04 UTC 2023), Entry for Chas W Johnson and Mary C Johnson, 1920.
"United States Census, 1930," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:XC96-7NQ : accessed 10 April 2023), Manda M Watterman in household of Elvin M Watterman, Enchanted, Coos, Oregon, United States; citing enumeration district (ED) ED 58, sheet 3A, line 2, family 46, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1942; FHL microfilm 2,341,676.