The listed coordinates do not contain the final however you will be required to visit this Historical marker and record the oldest date to solve the puzzle. Next, you will have to proceed to the second Historical marker (way point) and do the same. The final is at:
N 42 05.AAA (aaa= last three digits of oldest date at first stop minus 226)
W 076 03.BBB (bbb=last three digits of oldest date at second stop minus 226)