The National Library of Medicine’s (NLM) premier bibliographic database covering the fields of medicine, nursing, dentistry, veterinary medicine, the health care system, and the preclinical sciences. Contains bibliographic citations (e.g., authors, title, and journal reference) and author abstracts from over 3,900 biomedical journals published in the United States and 70 foreign countries during the current four years. Contains over 9 million records dating back to 1966.