000
00292nam a2200121Ia 4500
008
140317s9999 xx 000 0 und d
082
_a
631.5
100
_a
Hurd,R.G.
245
_a
Oportunities for increasing crop yields.
260
_a
Boston
_b
Pitman
_c
1980
300
_a
410
942
_2
ddc
_c
BK
999
_c
9615
_d
9615