PubMed provides over 22 million citations for biomedical and life sciences literature, including: biomedicine and health, behavioral sciences, bioengineering, biochemistry, genetics, molecular and cell biology.
CAB Abstracts is one of the largest agricultural databases covering international research and development literature in the fields of Agronomy, Animal health, Forestry, Human health, Human nutrition, and Management and conservation of natural resources.
PubAg is the U.S. Department of Agriculture, National Agricultural Library's search system for agricultural information. PubAg contains full-text articles relevant to the agricultural sciences, along with citations to peer-reviewed journal articles. The focus is on U.S. government research but also includes research articles published outside of government agencies.
A large database of peer-reviewed literature in all subject areas. In addition to citation searching, it features tools to track, analyze and visualize research. Scopus complements Web of Science and Google Scholar, but each of them contains enough unique information that none of them should be used exclusively.