Anyone use these books??

[NRAI2001]

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http://www.amazon.com/Underground-C...=sr_1_6?ie=UTF8&s=books&qid=1262162664&sr=1-6

http://www.amazon.com/Underground-C...=sr_1_9?ie=UTF8&s=books&qid=1262162664&sr=1-9

Any good? Cant find any reviews on them online..