Hearing Before the Special Subcommittee on National Science Foundation of the Committee on Labor and Public Welfare, United States Senate, Ninety-second Congress, First Session, on S. 1968, to Authorize Appropriations for Activities of the National Science Foundation, and for Other Purposes; [and] S. 1168, to Authorize Appropriations for Activities of the National Science Foundation, and for Other Purposes, June 2, 1971