000 00300nam a2200109Ia 4500
008 211214s9999 xx 000 0 und d
040 _cJayakar Knowledge Resource Centre
100 _aCastberg, P. H.
245 0 _aProduction study in economics
260 _bGeorge Allen Co
_aLondon
_c1914
942 _c1
999 _c18665
_d18665