Bethesda, Md. : U.S. Dept. of Health and Human Services, Public Health Service, National Institutes of Health, National Library of Medicine, Reference Section, 1995
Paper version no longer for sale by the Supt. of Docs.
Also available via Internet from the NLM web site. Address as of 7/2/02: http://www.nlm.nih.gov/pubs/cbm/critpath.html ; current access available via PURL.