00421nam a2200133Ia 4500008004100000082001500041100002100056245004000077260004100117300000700158942000700165952009800172999001700270140113s9999    xx            000 0 und d  a633.1   K7  a"Rohweder, D.A."  aMaximum crop yields : The challenge  a1967bAmerican Soc. AgronomycU.S.A.  a92  cBK  00104070aVTLbVTLd2014-01-13l0o633.1   K7pVBK1515r2014-01-13 00:00:00w2014-01-13yBK  c58194d58194