V, 12, R, 2, 29, 37, 14, 19, 26, 14, U, 5, 17, V, 47, 9, 14, N, 2, 37, U, R, 48, R, 22, Z, 30, 20, 37, N, 29, R, 44, 8, U, L, 25, 45, 33, 37, N, 1
This is a book code.
The passage used to encrypt the text is in this riddle:

Where is the passage of 48 words
that describes the world of four provinces?
Is it hidden in a tab about it,
or placed in the darkest depths?