The Merck Index is a fully-searchable database with over 11,500 monographs on chemicals, drugs, and biologicals.
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Free online medical information guides for patients, caregivers, healthcare professionals and chemists.
Good resource for CNS imaging combining clinical data with MR, CT, and nuclear medicine images.
Zoological Record indexes more than 5,000 serials, as well as books, conferences, and reports. It includes all aspects of animal research, including ecology, biodiversity, evolution, physiology, taxonomy, etc.