Here's a few things I processed information from;
1856, 1880,1920 and 1930 Census Records for the state of Iowa
Cemetery/Burial Records
Obituaries
County Birth Records/Marriage Records
American Homefindings Association in Ottumwa, IA
Recommended Sites to Search:
findagrave.com
iagenweb.org
usweb.org
rootsweb.com
familytreemaker.com
genforum.genealogy.com