American Genealogy & History Project
[The original link is broken. This link points to an archived copy on the Wayback Machine]
FamilySearch Wiki - Plymouth County, Iowa
Free online genealogical research guide for Plymouth County, Iowa.
Free online genealogical research guide for Adair County, Iowa.
Linkpendium - Plymouth County, Iowa
NACo (National Association of Counties) - County Explorer
Plymouth County Courthouse History History
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