AGRICOLA (AGRICultural OnLine Access) database serves as the catalog and index to the collections of the National Agricultural Library, as well as a primary public source for world-wide  access to agricultural information. The database covers materials in all formats and periods, including printed works from as far back as the 15th century. Agricola contains two primary information sets, the NAL Online Public Access Catalog which contains citations to materials (mostly) held in the NAL's collection, and the Article Citation
Database, which includes citations, many with abstracts, to articles, book chapters, reports, and reprints. 1970-1985 is international in scope. 1985+ focuses on U.S. related publications.