Where's George?
http://www.wheresgeorge.com
Tracks US dollar bills by serial number
CNN story on writing on money:
http://www.cnn.com/US/9902/23/fringe/writing.on.money/
Communities that print their own currencies:
http://www.ratical.org/many_worlds/cc/
US Dollar Info:
Ron Wise's World Paper Money Page
http://aes.iupui.edu/rwise/
Collection of scans of international currency
US Bureau of Printing and Engraving:
http://www.bep.treas.gov/
Currency circulation (includes bill life expectancy):
http://www.ny.frb.org/pihome/fedpoint/fed01.html
Glen's World Bank Note Page
http://members.aol.com/GGS1/Index/Page_1x.html
Info on money printing techniques and features
Secret Service: "Know Your Money"
http://www.treas.gov/usss/index.htm?know_your_money.htm1
Ugly Money:
http://www.uglymoney.com/
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