Compiled by Foothill Hydroponics. This book contains 4 chapters and a total of 110 pages of information. Chapter 1 deals with species and requirements for each. Chapter 2 is hydroponics growth media and the pros and cons of each type. Chapter 3 focuses on plant nutrition and hydroponics solutions. Chapter 4 offers information on irrigation and hydroponics systems. A great reference for experienced gardeners and a must have for new gardener/collector.