000 002690000a22001210004500
245 _aIntroduction to exchange sytems
100 _aFlowers, T.H.
260 _aNew York
_bWiley
_c1976
300 _a326 p.
080 _a621.395.722
_bF6
041 _aEN
942 _cBK
999 _c103237
_d103237