Hearings before the Select Committee on Equal Educational Opportunity of the United States Senate, Ninety-first Congress, Washington, D.C., August 18, 19, 20, 21, 1970; Hearings before the Special Subcommittee on Bilingual Educationof the Committee on Labor and Public Welfare, United States Senate, Ninetieth Congress, First Session on S.428, June 24 and July 21, 1967.