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My personal No. 1 Koi Book, good price, very informative, Great pictures, good illustrations and very easy to read.
A must have book, by Peter Waddington, Eight books in one (if you can afford it, go for the leather bound one)
Extremely good book. Again easy to read with great images, but not as big as the previous 2 books above.
Unfortunately I haven't read this one yet! But I have heard good things about it.
Likewise, I haven't read this one either.