%0 U.S. Federal Government Document %0 Print %0 Book %E United States. Congress. House. Committee on Government Operations %I U.S., Govt. Print. Off. %D 1958 %C Washington, %G English %T Air pollution; Federal Air Pollution Research and Technical Assistance Program. Hearing before a subcommittee ... Eighty-fifth Congress, first session. October 31, 1957.