01229nam a2200301Ia 4500 20240 BIBL 20160527193416.0 690513r1969 pauab b 00000 eng 68026200 //r86 EVLG 339.4973 P415 c1 S942 .P45 1969 333.7/2/0973 339.4973 P415 University of Pennsylvania. Bicentennial Conference. Local 183289 Conservation of renewable natural resources some fundamental aspects of the problem by Raphael Zon [and others] Port Washington Kennikat Press [1969, c1941] vi, 200 p. illus., maps. 25 cm. Morris Arboretum monographs, 2 Local 139059 Essay and general literature index reprint series Local 93149 Includes bibliographies. Conservation of natural resources United States. Local 79833 Ozone Physiological effect. Local 146410 Botany United States. Local 64327 United States Climate. Local 182913 Zon, Raphael 1874-1956. Local 192181 Pennsylvania. University. Morris Arboretum. Monographs 2 14661 14661 0 0 0 339_497300000000000_P415 0 evl 206711 10 10 1 2016-05-27 28480 0 339.4973 P415 80000000473226 2016-05-27 00:00:00 r:20240 z:NCC:D 6