"United States Census, 1900," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M9MZ-VHT : accessed 13 Oct 2014), Mahala J Hardin in household of Perry Hardin, Pike Township, Marion, Indiana, United States; citing sheet 3B, family 59, NARA microfilm publication T623, FHL microfilm 1240391.
"United States Census, 1910," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MKPL-JRS : accessed 13 Oct 2014), Jennie Hardin in household of Perry Hardin, Washington, Marion, Indiana, United States; citing enumeration district (ED) 25, sheet 6A, family 130, NARA microfilm publication T624, FHL microfilm 1374379.
Her son's marriage: "Indiana, Marriages, 1780-1992," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/XF46-625 : accessed 13 Oct 2014), Mahala J. Eaton in entry for Orval F. Hardin and Marie Herdrich, 14 Feb 1914; citing reference Ind Mar p335; FHL microfilm 1316570.