00350nam a2200121Ia 4500001000500000005001700005008004100022082001500063100002800078245005400106260002600160650004200186320820261006003703.0120911s9999    xx            000 0 und d  a363.73 ENV  aed. Helfrich, Harold W.  aThe environmental crisis / ed. Harold W. Helfrich  aYale University Press  aPollution - addresses,essays,lectures