Prescription Drug Rebate Program: Hearing Before the Subcommittee on Health and the Environment of the Committee on Energy and Commerce, House of Representatives, One Hundred Second Congress, Second Session, on H.R. 2890, H.R. 3405, and H.R. 5614, Bills to Amend the Public Health Service Act and the Social Security Act to Establish Limits on Certain Drug Prices, July 31, 1992, Volume 4