00399cam a2200145Ki 4500 699.3 COP Kroch, Eugene A. 45193 copper data. . New York : Columbia University, Graduate School of Business, 1953. [76 .]P. Research paper ; 0 0 0 699_300000000000000_COP MCE 379 ddc BK 548765 548765 0 0 ddc 0 0 MCE MCE 2014-09-05 0 699.3 COP MCE-41060 2014-09-05 2014-09-05 BK