Blast, that is a great idea! The U.S. Department of Agriculture maintains a website with direct links to the Cooperative Extension Service Offices in every state: www.csrees.usda.gov/Extension/

Those state offices offer an incredible variety of free and often downloadable publications on gardening and a multitude of other topics. In turn, many states have local Extension Service Offices in every county. The information they offer is tailored to local growing conditions.