1. and , “Ames Laboratory Selective Dissemination of Information Computer Systern,” U.S.A.E.C. Rept. IS-751, 1963.
2. International Business Machines Corporation, “General Information Manual, Keyword-In-Context (KWIC),” IBM Technical Publications Dept., 1962.
3. Institute for Scientific Information, Philadelphia, Pa. Current magnetic tapes (which were not used in this study) are employed by the Ames Laboratory for cover age of all U. S. Patents and the more than 1060 scientific journals as indexed in the Science Citation Index —1965.
4. “Selective Dissemination of New Scientific Information with the Aid of Electronic Processing Equipment,” presented at the 126th Meeting of the American Association for the Advancement of Science, ACM, Chicago, Illinois, December 29, 1959.
5. Euratom-Thesaurus (Keywords Used Within Euratom's Nuclear Energy Documentation Project), Brussels, February 1964.