Good information, and very easy to read. While he didn't go into enough detail in some areas for my taste, Ball gave a good overview of many important aspects of food production and how to extend your growing season. He also includes several good charts on planting times and preservation techniques.
this book isn't about specifics, but it's a great planning guide to help get you started on intensive gardening in your backyard. there are charts in the back that go over specifics, but the author even recommends using another resource for that sort of material.