The End of an Era Mystery Cache
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Difficulty:
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Terrain:
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Size: 
(small)
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WW2 at home, off sick and feeling bored. Looking at another cache desperately searching for inspiration to impress WW1 at her puzzle solving abilities (HA! HA!) Came across this: decides to reminisce and so the following puzzle came to be (not that this will probably help you solve it).
After (AB) years its the end of an era.
Humphries,Stanton,Shaw & Lewis have long moved on to other things and it just wasn't the same anymore.
Find what this all refers to and then you'll be on your way to finding the cache.
Additionally you need to find out:
How many were there? (CDE)
When those named above first appeared (FGHJ) (follow wiki)
One of the person's named had a difficulty - having found the person how many letters does this difficulty have? (K)
The final cache can be found at:
N 51 EH.(A+1)(J-C-2)(G+B-C)
W 000 A(F+3).(D+G-1)(C-E)(K+1)
Additional Hints
(Decrypt)
Ybj qbja