1"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MXQJ-P3H), Charlotte Martin in household of Reubon Martin, Madison, Lake, Ohio, United States; citing family 415, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
2"United States Census, 1860", database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M822-GN7 : accessed 26 May 2016), Charlott Martin in entry for Ruben Martin, 1860.
3"Find A Grave Index," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/QV26-ZZC5 : accessed 26 May 2016), Charlotte S. Martin, 1877; Burial, Olds, Henry, Iowa, United States of America, North Wayne Cemetery; citing record ID 69247771, Find a Grave, http://www.findagrave.com.