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This book reviews the study of b quarks and also looks at the implications of future studies. The most important observations thus far - including measurement of the "B" lifetime and observations of b -> u transitions - as well as the more mundane results of hadronic and semileptonic transitions are described in detail by experimentalists who have been closely involved with the measurements. Theoretical progress in understanding b quark decays, including the mechanisms of hadronic and semileptonic decays, are described. Synthesizing the experimental and theoretical information, the authors discuss tests of the standard model and measurements of standard model parameters. The possibilities of more extensive tests using measurement of CP violation in the B system are also addressed.