"United States Census, 1930," database with images,
FamilySearch (
https://familysearch.org/ark:/61903/1:1:X3DZ-L58 : accessed 23 September 2021), John De Krick, Clinton, Rock, Minnesota, United States; citing enumeration district (ED) ED 4, sheet 1A, line 31, family 6, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1125; FHL microfilm 2,340,860.