000			00678nam a2200217Ia 4500
008			130910s9999 xx 000 0 und d
041			_aeng
082			_221st ed. _a333.72 _bALL/C
100			_aAllen, Shirley W.
245			_aConserving natural resources : _bprinciples and practice in a democracy _cShirley W. Allen
260			_aNew York : _bMcGraw-Hill Book Company , _c1955
300			_aix, 336 p. : ill.
300			_epictures
504			_aIndex: p. 337-47.
653			_aConservation of natural resources
653			_aMines and mineral resources
653			_aSoil conservation
653			_aWater conservation
653			_aWildlife conservation
942			_cEN _2ddc
999			_c14708 _d14708