PubMed comprises more than 22 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.
Scholarly articles in over 150 academic journals. Articles date from the 1800s up to a "moving wall" of between one and eight years before the present. Coverage includes the arts, business, general science, the humanities, and social science.
Tech Connect offers links to over 360,000 full-text articles and 2.5 million citations from the US Department of Energy. Covers subjects from biology and medicine, environmental science, renewable energy sources, and more.