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Air Pollution
Auto pulverizer machines will stop scrap fires
University of Iowa chemist finds exhaust from autos a threat to rural areas
Ecologist D.A. Spencer sees pesticide overrated as pollutant
Pollution parley set for June 5-6
Difficulty in disposal of munitions
President Nixon names unit to fight all pollution
Cleaning up Iowa's air
5 industries, 13 junkyards get pollution ultimatum
Pollution law 'a year away'
Chas. C. Johnson, Junior warns Iowa health group: 'No pollution immunizatio
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