PubMed comprises more than 27 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.
EMBASE Reference database with more than 23 million biomedical and pharmacological citations from 1974, including Medline from 1966. Issued by: Elsevier
Agricola Reference database of the American National Agricultural Library with data records from 1970, including veterinary medicine
CAB Abstracts Specialist literature from all areas of agriculture and related fields (botany, soil science, biotechnology, livestock farming, agricultural economics, rural sociology, agricultural technology, veterinary medicine, forestry, aquaculture, fishing, nutritional science, food science, environmental science)