AGRICOLA This link opens in a new windowThe NAL Catalog (AGRICOLA) provides citations to agricultural literature. This database contains bibliographic records from the U.S. Department of Agriculture's National Agricultural Library. Coverage for AGRICOLA dates back to 1970 and includes more than 4.8 million citations. The citations are comprised of journal articles, monographs, theses, patents, software, audiovisual materials, and technical reports related to agriculture.