airborne pollution's toll on trees and crops MacKenzie, James J. creator EL-Ashry Mohamed T. text New York World Resources Institute c1988 monographic vi, 74 p. : ill. James J. MacKenzie, Mohamed T. EL-Ashry Bibliographical references p. 61-74 Plant Culture SB745 .M334 0915825295 UOEL 000 20170717123306.0