Authorize appropriations for certain maritime and Coast Guard programs : hearings before the Merchant Marine Subcommittee of the Committee on Commerce, United States Senate, Ninety-second Congress, first session on S. 981, to authorize appropriations for certain maritime programs of the Department of Commerce : S. 1220, to amend the act to authorize appropriations for the fiscal year 1971 for certain maritime programs of the Department of Commerce : S. 1223, to authorize appropriations for procurement of vessels and aircraft and constructions of shore, and offshore establishments for the Coast Guard, March 30, 1971.