After finding a value for each letter, the cache can be found at
N51 ((A/B)+C) (D-E) . ((GxH)+(I-F)) (J-L) (K x square root of M)
W001 (O/Q) (N+S) . (P+R+T) (U+W+X) (Z-(V/Y))
First Poem:
A for the B that was C :
In D it dwells;
There shall be E taken
Stronger than F - G .
There shall be shown a H
That I is near at hand,
For J K shall waken,
And the L forth shall M .
Second Poem:
In N lands beneath the Sun
the O may rise in Spring,
the P may bud, the waters run,
the merry Q sing.
Or there maybe 'tis R night
and swaying beeches bear
the S - stars as jewels white
amid their T hair.
Though here at U end I lie
in V buried deep,
beyond all W strong and high,
beyond all mountains steep,
above all X rides the Sun
and Stars forever dwell:
I will not say the Y is done,
nor bid the Stars Z.