000 00287nam a2200121Ia 4500
008 191004s9999 xx 000 0 und d
082 _a330
_bHAL/E
100 _aHALM, George N
245 0 _aEconomic systems
260 _bOxford & IBH Publishing Co. ,
_c1951
300 _a420p
942 _cBK
999 _c189
_d189