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Sampling and analysis of toxis organics in the atmosphere : a symposium sponsored by ASTM committee D-22 on sampling and analysis of atmospheres American Society for Testing and Materials Boulder, Colo., 6-9 aug. 1979 - Philadelphia : American Society for Testing and Materials, c1980 - 192 p. : ill. ; 24 cm. - ASTM Special Technical Publication ; 721, S.S. Verner, U.S. Environmental Protection Agency, symposium chairman .