000 00292nam a2200121Ia 4500
008 140317s9999 xx 000 0 und d
082 _a631.5
100 _aHurd,R.G.
245 _aOportunities for increasing crop yields.
260 _aBoston
_bPitman
_c1980
300 _a410
942 _2ddc
_cBK
999 _c9615
_d9615