Thomson's Barnyard (Otago) Mystery Cache
Trigger_Fish: I am archiving this one as it is clearly missing.
Thomson's Barnyard (Otago)
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Difficulty:
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Terrain:
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Size: 
(small)
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Please don't visit the listed co-ordinates, there is no cache there.
A puzzle cache requiring internet or library research. Though the cache is some way from the barnyard, the link between the final location and the puzzle theme will be obvious when you reach the cache location.
Thomson was born in the year ABCD
Thomson died in EFGH
I = A+D
J= C+E
K= E+H
L= F-C
M= G-D
N= B+E
The cache is located at S 45 KJ.LML E170 IB.JNM
Additional Hints
(No hints available.)