http://www.galmarley.com/framesets/fs_fiat_money.htm

http://www.onlinecoins.co.uk/

http://www.dnw.co.uk/dnw/coins/AboutCoinsSite.htm

http://www.predecimal.com

http://www.lbma.org.uk/statistics_current.htm

http://www.goldinfo.net/

http://www.tclayton.demon.co.uk/values/sov.html

http://www.econlib.org/library/YPDBooks/Jevons/jvnMMEtoc.html

http://www.coin-gallery.com/cggradingart.htm