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%A Alfred J. Menezes %A Paul C. van Oorschot %A Scott A. Vanstone %B Handbook of Applied Cryptography %I CRC Press %D October 1996 %P 816pp %G ISBN 0-8493-8523-7

I haven't read this one, but whenever you mention Bruce Schneier's Applied Cryptography to some crypto fanatic, he'll mention this one as an alternative. From what I've read this one is much more hardcore mathematical.

The official HAC web page includes the whole book in downloadable format.