000 00315nam a2200145Ia 4500
008 190201s9999 xx 000 0 und d
082 _a621
082 _b31 KIR
100 _aKirchmayer Leon K
245 0 _aEconomic Operation Of Po
260 _aNew Delhi
260 _bW.E.L
260 _c1971
300 _a259
999 _c20819
_d20819