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The SAO/NASA Astrophysics Data System (ADS) covers three main areas: Astronomy and Astrophysics, Physics and Geophysics, and the arXiv e-prints server. ADS also links out to astronomical object information, data catalogs, data archives, and more. This link takes you to the Modern Search interface--from there you can switch to the Classic Form if desired.
A rapid way to search 25+ biology-related databases all at once, including MEDLINE, TOXNET, ASFA, and more. Source types include scholarly journals, trade journals, conference proceedings, books, government publications, magazines, newspapers, reports, video and audio. Date range varies based on what databases ProQuest chooses to include in the collection.
The most comprehensive medical database. This resource covers medicine, dentistry, nursing, physical therapy, biomedical research, clinical practice, administration, policy issues, and health care services. Content dates from 1950 - present. This version uses the FirstSearch platform.