000 00306 am a2200121 a 4500
100 1 _aSpafford, W.J.
245 1 _aTillage of the soil
260 _aAdelaide
_c1923
300 _a1-16 p.
942 _2udc
_cB
440 _aSoil South Australia Department of Agriculture. Bulletin No. 172
901 _aS50670
999 _c107864
_d107864