MEDLARS: the computerized literature retrieval services of the National Library of Medicine
National Institutes of Health (U.S.)
[Bethesda, Md.] : Dept. of Health, Human Services, Public Health Service, National Institutes of Health, 
Information Storage and Retrieval
National Library of Medicine (U.S.)
See catalog record: 101582104
Edition: Rev. March 1981.
NLM Permanence Rating: Permanent: Stable content