Legislation to prohibit sex discrimination on the basis of pregnancy. [Part 1], Hearing held in Washington, D.C., April 6, 1977 : hearing before the Subcommittee on Employment Opportunities of the Committee on Education and Labor, House of Representatives, Ninety-fifth Congress, first session on H.R. 5055 and H.R. 6075, to amend title VII of the Civil Rights Act of 1964 to prohibit sex discrimination on the basis of pregnancy