000			00501nam a22001932 4500
001			0000037428
005			20170918153556.0
008			110413s xx 000 0 eng d
020			_a0126565600
100	1		_aSPEDDING, C.R.W.,
245	1	0	_aBiological efficiency in agriculture :
250			_a ed.
260			_aLondon : _bAcademic Press, _c1981.
300			_a383 p.
504			_aIncludes bibliographical references and index.
650		0	_aField crops
650		0	_a
908			_a110413
999			_c17451 _d17451