Greenback: Sounds like it's gone, thanks to everyone who hunted this cache, and who enjoyed the geoart series.
GC3PYDX ▼
Size:  (small)
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The posted coordinates are FALSE! The caches in this series are NOT accessible from the express way.
The final will be found here: N41° 31.1XX W88° 11.200
Additional Hints (Decrypt)
Decryption Key
A|B|C|D|E|F|G|H|I|J|K|L|M ------------------------- N|O|P|Q|R|S|T|U|V|W|X|Y|Z
(letter above equals below, and vice versa)
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You'll collect a digital Treasure from one of these collections when you find and log this geocache: