This is a short 3 stage field puzzle that will give you a chance to read some history about the area while you're stretching your legs at this west bound rest area.
The posted coordinates will bring you to an historical marker that gives some information about Fort Riley and Junction City that you will pass by if you continue west on the interstate. Find the year the Junction City was incorporated and call this ABCD.
Proceed to the stage 2 waypoint (you know you were headed there anyway). Here is another historical marker that gives information about the Interstate Highway System in Kansas. Find the year that this highway was proclaimed the "Purple Heart Trail". Call this year EFGH.
The cache can be found at N 39 04.FC(D-E) W 096 37.H(A+C)(A+E+H)