"United States Census, 1930," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/X38Z-BF4 : accessed 15 March 2015), Bertha M Anderson in household of Pete E Anderson, Dassel, Meeker, Minnesota, United States; citing enumeration district (ED) 0010, sheet 7A, family 168, line 3, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1106; FHL microfilm 2,340,841.