A = Kind Hearts and Coronets.
B = Bullen.
C = Agricola
D = Duke of Norfolk
E = WWII Camouflage development.
F = Largest inhabited one in the world.
The cache can be found at:
N 51 2?.??? where ???? = (F + A + B) x (A x B) - E - D - F
W 000 4*.*** where **** = (A + C + D + E) x (A x B) - A
You can check your answers for this puzzle on Geochecker.com.