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Dear Ms. Harvey,
Thank you for posting your request on History Hub!
Depending on when and where they died determines where to look. We suggest that you review the Illinois State Archives Guidelines for Genealogical Research and the FamilySearch Research wiki for Indiana, Illinois and Iowa. Also, please check the Woodford County Illinois and Marion County Iowa FamilySearch resources. If Catherine remarried after her husband’s death, we suggest searching marriage records for evidence of her new last name.
We hope this is helpful. Best of luck with your family research!