A few years back I purchased an
Indiana Atlas & Gazetteer which has detailed county maps with townships. Cost about $20, and has been one of the best purchases I have made. I do know
Barnes &
Nobles carries them, maybe even Target, Walmart or Sam's Club.
This map is on the INGenWeb -
Jasper County site:
http://home.att.net/~Local_History/Jasper-Co-IN.htm and in comparing this map to the Gazetteer map, it appear it hasn't changed from 1875 to current day. I hope this helps..................Karen