A Guide To Copper Production and Manufacturing Process
http://www.ntriiv.com/memberlist.php?mode=viewprofile&u=1265

Why Copper Is Used to Make Electrical Wires
http://bleachforums.com/showthread.php?p=1420644#post1420644


Global Copper Consumption
http://klasa1egm8.phorum.pl/viewtopic.php?f=1&t=6556

Why Is Copper So Valuable?
http://776.tw/viewthread.php?tid=1139883&page=1&authorid=603044

Top Copper - Producing Companies
http://2xianqiao.com/forum.php?mod=viewthread&tid=952&extra=

Does the Conductivity of Copper Vary With Temperature?
http://www.suanpan.go.th/webboard/index.php?topic=128.0