Save yourself time. Do targeted reading.
Use the table of contents and index.
Use the table of contents to identify parts of the book that cover your topic. Chapter 2 is good if you want information on pesticides. Chapter 7 has info on making organic food choices.
The index tells you anywhere in the book that a topic is discussed. In the example above, chicken meat and chickens are discussed on pages 74-75, 110, 112-114 and 162. The certified organic label is a big topic, so the index breaks it down - federal standards, state standards, USDA labeling, etc. This helps you find exactly what you need quickly. The index also tells us to "see also" organic certification.