AGRICOLA serves as the catalog and index of the U.S. National Agricultural Library. All aspects of agriculture and allied disciplines are covered. It is primarily a citation-only database with some full-text material.
AGRIS is a global database providing access to bibliographic information on agricultural science and technology, including grey literature not available through normal publication and distribution channels.
The Aquatic and Invasive Plant Information Retrieval System (APIRS) includes annotated citations to peer-reviewed and gray literature and reports, with aquatic, wetland and natural area invasive plants as the focus.