Maskedgeek: for what it's worth, here's a couple of websites where you might be able to double check BillA's info:
www.copper.org
http://www.busbymetals.com/wire.htm
http://www.ccbda.org/
and the google search:
http://search.yahoo.com/bin/search?p=copper+alloy
(Always confirm your data from at least 2 other sources)