"Breed Your Own Vegetable Varieties" by Carol Deppe
Breed Your Own Vegetable Varieties: The Gardener’s and Farmer’s Guide to Plant Breeding and Seed Saving
By Carol Deppe. 2nd edition, 2000. 348 pages.
Possibly the most important and entertaining garden book currently in print. Reading this book will empower your seed stewardship abilities and catapult you further into a world of plant fun.