http://boogystyle.free.fr/Forum/viewtopic.php?p=56939#56939 - of tsvetmet copper
Total copper demand by sector and scenario, 2020-2040
http://junlinro520.gain.tw/viewthread.php?tid=540885&extra=
What is Copper Metal Used For?
Why is copper so important?
http://www.schalke04.cz/forum/viewthread.php?thread_id=115168
сколько стоит металлолом меди за 1 кг
Does the conductivity of copper vary with temperature?
http://a-barnaul.ru/viewtopic.php?t=115