PROBLEMS OF AIR POLLUTION IN THE DISTRICT OF COLUMBIA JOINT HEARINGS BEFORE THE SUBCOMMITTEE ON BUSINESS AND COMMERCE AND SUBCOMMITTEE ON PUBLIC HEALTH, OF THE COMMITTEE ON THE DISTRICT OF COLUMBIA NINETIETH CONGRESS FIRST SESSION ON PROBLEMS OF AIR POLLUTION IN THE DISTRICT OF COLUMBIA MARCH 8, 9, 13, 14, 15, AND 16, 1967 Printed for the use of the Committee on the District of Columbia 77-536 O U.S. GOVERNMENT PRINTING OFFICE WASHINGTON: 1967 PROBLEMS OF AIR POLLUTION IN THE DISTRICT OF COLUMBIA JOINT HEARINGS BEFORE THE SUBCOMMITTEE ON BUSINESS AND COMMERCE AND SUBCOMMITTEE ON PUBLIC HEALTH, OF THE COMMITTEE ON THE DISTRICT OF COLUMBIA NINETIETH CONGRESS FIRST SESSION ON PROBLEMS OF AIR POLLUTION IN THE DISTRICT OF COLUMBIA MARCH 8, 9, 13, 14, 15, AND 16, 1967 Printed for the use of the Committee on the District of Columbia 77-536 O U.S. GOVERNMENT PRINTING OFFICE WASHINGTON: 1967 |