"United States Census, 1900," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MS95-SHW : accessed 14 Nov 2013), Derk Kieft, ED 122 Grand Haven city Ward 3, Ottawa, Michigan, United States; citing sheet 7B, family 162, NARA microfilm publication T623, FHL microfilm 1240738.
"United States Census, 1870," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MHCD-M5R : accessed 14 Nov 2013), Dirk Kieft, Michigan, United States; citing p. , family 492, NARA microfilm publication M593, FHL microfilm 000552196.