Harvest Hammer Duathlon
Sports, Multi-Sports, Duathlon, Events - Harvest Hammer Duathlon. Duathlon situated in the heart of Northwestern Illinois.
http://www.harvesthammer.org/
Apple Duathlon
Sports, Multi-Sports, Duathlon, Events - Apple Duathlon. It is a 10k-42k-5k event.
http://www.appleduathlon.com/