"United States Census, 1860," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M8LM-F9Q : accessed 24 February 2015), Sikka Lantman, 4th Ward Keokuk City, Lee, Iowa, United States; from "1860 U.S. Federal Census - Population," Fold3.com; citing p. 186, household ID 1423, NARA microfilm publication M653, National Archives and Records Administration, Washington, D.C.; FHL microfilm 803,330.