United States. Congress. Senate. Committee on Public Works. Subcommittee on Air and Water Pollution & ProQuest (Firm). (1973). The Administration's proposal for relaxation of air pollution standards: Hearing, Ninety-third Congress, first session. U.S. Govt. Print. Off.
Chicago Style (17th ed.) CitationUnited States. Congress. Senate. Committee on Public Works. Subcommittee on Air and Water Pollution and ProQuest (Firm). The Administration's Proposal for Relaxation of Air Pollution Standards: Hearing, Ninety-third Congress, First Session. Washington: U.S. Govt. Print. Off, 1973.
MLA (9th ed.) CitationUnited States. Congress. Senate. Committee on Public Works. Subcommittee on Air and Water Pollution and ProQuest (Firm). The Administration's Proposal for Relaxation of Air Pollution Standards: Hearing, Ninety-third Congress, First Session. U.S. Govt. Print. Off, 1973.