000			00375 a2200145 4500
080			_a631.95 _bA 512 P
245	1		_aAmerican Institute of Crop Ecology study series _b25 : _cby M.Y. Nutonson
260			_aWashington _c1958
650			_aAgricultural Ecology
650			_aPhysical Environment
650			_aAgriculture
100			_a _d
300			_a1130 p.
901			_a74297
999			_c45660 _d45660