"United States Census, 1920," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MWT5-HRB : accessed 10 Sep 2014), Herman J Janzen, Aitkin, Aitkin, Minnesota, United States; citing sheet 12A, family 123, NARA microfilm publication T625, FHL microfilm 1820822.
"United States Census, 1930," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/X3CK-VJJ : accessed 10 Sep 2014), Herman J Janzen, Aitkin, Aitkin, Minnesota, United States; citing enumeration district (ED) 0001, sheet 5A, family 87, NARA microfilm publication T626, roll 1078.
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