"United States Census, 1930," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XQB9-FKJ : accessed 12 Oct 2014), Herman Schmidtman, Campbell, Ionia, Michigan, United States; citing enumeration district (ED) 0009, sheet 10A, family 249, NARA microfilm publication T626, roll 992.