00481nam a2200121   450008200160000024500980001626001140011430000250022850000580025365000300031165000100034165000080035100a628.51 ENV 00aEnvironmental control seminar proceedings, Rotterdam, Warsaw, Bucharest, May 25-June 4, 1971.  aWashington,bBureau of International Commerce; for sale by the Supt. of Docs., U.S. Govt. Print. Off.,c1971.  aviii, 297 p.billus.  a"A United States Department of Commerce publication." 0aEnvironmental engineering 0aWater 0aAir