The cache can be found at the following coordinates:
N 45 52.AAA W 090 24.BBB
The given coordinates will take you to a historic maker. Read the marker to solve the puzzle.
AAA = 2687 minus (-) the year that Fifield was established
BBB = 2865 minus (-) the year fire destroyed Fifield's business district
Fifield is one of those "in between" places you rarely stop in unless it's for gas. Now you get to learn something about it.