National Science Research Data Processing and Information Retrieval System : hearings before the General Subcommittee on Education of the Committee on Education and Labor, House of Representatives, Ninety-first Congress, first session, on H.R. 8809, a bill to amend Title IX of the National Defense Education Act of 1958, to provide for establishment of a National Science Research Data Processing and Information Retrieval System, hearings held in Washington, D.C., April 29 and 30, 1969