The Iowa State University Master Gardener’s webpage has a host of gardening resources including many free publications and downloadable information. On their website you can search with a key topic. They also have a commonly requested “Suggested vegetables for home garden” document that is very good and is a free download. There may be a cost listed for some publications.
Best of all there are links to live resources such as the “ask a master gardener” which is located on the right side bar of their website where you can email questions to experts.