000 00392nam a2200133Ia 4500
008 130225s9999 xx 000 0 und d
100 _aZook, L.L., Weakly, H.E.
245 _aCrop rotation and tilage experiments at the north platte(Nebr.) substation: 1907
260 _aWashington
_c1950
300 _a1-78 p.
440 _aUnited States Department of A
901 _a28996
942 _cB
_2udc
999 _c5525
_d5525