Environmental control seminar proceedings, Rotterdam, Warsaw, Bucharest, May 25-June 4, 1971.
Washington, Bureau of International Commerce; for sale by the Supt. of Docs., U.S. Govt. Print. Off., 1971.
Water > Pollution > Congresses.
Air > Pollution > Congresses.
"A United States Department of Commerce publication."
viii, 297 p.
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