61
The final coordinates for this cache are North AB CD.EFG, West HI JK.LMN
The numbers for those values are the last digit the following states earned their statehoods. For instance, Kansas (which achieved statehood in 1861) would be 1.
A = West Virginia
B = New Hampshire
C = Texas
D = Alabama
E = Florida
F = Indiana
G = Colorado
H = North Carolina
I = Arkansas
J = Vermont
K = Iowa
L = Ohio
M = Nevada
N = Mississippi
You can check your answers for this puzzle on GeoChecker.com.