000 00293nam a2200121Ia 4500
008 220204s9999 xx 000 0 und d
082 _a330.356.7
_bHEA
100 _aHEATHFIELD, D F
245 0 _aProduction functions
260 _aLondon
_bMacmillan
_c1971
650 _aEconomics
942 _cBK
999 _c25076
_d25076