National Register of Historical Places - Mahaska County - Provides a listing of properties, districts, and landmarks in the county. Includes architectural style and period of significance. - http://www.historicdistricts.com/IA/Mahaska/state.html
The Political Graveyard: Mahaska County, Iowa - Database provides political history, cemetery locations, and brief biographies of politicians who were born, lived or died in the county. - http://politicalgraveyard.com/geo/IA/MH.html#BORN