Malt: A Practical Guide From Field To Brewhouse by Mallett

This book provides a comprehensive overview of malt, with primary focus on barley, from the field through the malting process. With primers on history, agricultural development and physiology of the barley kernel, John Mallett (Bell's Brewery) leads us through the enzymatic conversion that takes place during the malting process.

This book, Malt: A Practical Guide from Field to Brewhouse by Mallett, along with the Yeast, Hops, and Water books, is a must have for any serious brewer.