A good text on history of pomology from the ancient times. In each county of the United States there is a county extension office, whose purpose is to provide the citizens of the county information on a variety of topics relating to agriculture and home economics. In many cases they provide classes for homeowners in fruit production practices as well as written bulletins and pamphlets. The information that they provide is usually more tailored to your local growing conditions. You can find your local office by looking in the phone book in the county government section.
Many book stores have home gardening sections.
In these you can find a vast array of pamphlets specifically written for homeowners. Two such series are the Ortho Home Garden and Sunset Books. Gardening- FruitS by H. Baker. This text covers some of the more unusual native plants that are edible and includes chapters on pawpaw, gooseberry, persimmons, mulberry and more. 101 Fifth Ave.