This is the first Pure Discus book I bought, it's short and sweet. *thumbsupsmiley* It gave me a good overview of what Discus are all about and dispels a few myths to boot! If you're a novice it's a great book as it's not too technical, just the core facts.
Try it (it's cheap too ;D), you can't go wrong....
http://www.amazon.com/exec/obidos/ASIN/0812046692/qid=1029970195/sr=2-2/ref=sr_2
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