A simple 2 stage multi. Grab the information at the first stage and find the geocache at the second stage.
At the posted coordinates you will find several tables. On each one is a label with the manufacturer information.
A= (First number in the P.O. Box number) - (Second number in the zip code)
B= First number in the phone number
C= Last number in the zip code
D= Second number in the telephone number
E= Third number in the zip code
F= (Third number in the phone number)+( Eighth number in the phone number)
G= Fourth number in the zip code
The final can be found at N 45° 08.ABC W 093° 2D.EFG
You can validate your puzzle solution with certitude.