00332cam a2200121Ki 4500082001500000100002100015245002200036260007300058300001300131490002100144526003700165650000800202  a699.3bCOP1 aKroch, Eugene A.14a copper data.b .  aNew York :bColumbia University, Graduate School of Business,c1953.  a[76 .]P.1 aResearch paper ;  a0b0c0d699_300000000000000_COP  aMCE