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It's from a review of Ghost Medicine that was published in the February issue of VOYA (Voice of Youth Advocates). It's a magazine for Young Adult librarians.
Their review codes at the top, taken from VOYA, mean this:
5Q Hard to imagine it being better written.
4P Broad general or genre YA appeal.
J Junior High (defined as grades 7-9).
S Senior High (defined as grades 10-12).
No need to say anything else there.
I am honored.