000 00294nam a2200121Ia 4500
008 191031s9999 xx 000 0 und d
100 _aRobertson (CA)
245 0 _aIntrod to agrl. Products economics and farm management
260 _bTMH
260 _c1971
365 _b15.00
942 _cBK
999 _c201297
_d201297