v. 5, v. 6, v. 7. -- U.S. Govt. Print. Off., 1972-. -- (Competitive problems in the drug industry : hearings before the Subcommittee on Monopoly of the Select Committee on Small Business, United States Senate, Ninetieth Congress, first session [-Ninety-fifth Congress, first session], on present status of competition in the pharmaceutical industry ; pt. 24, 26).