Bureau of Engraving and Printing's (BEP)
takes you to the official government site of the BEP
for some interesting information and facts on all of
our US currency.
US Papermoney will take you to a site that
is full of information on everything you ever wanted
to know about our US currency. Almost everything
anyway. Very cool site!
American Numismatics Association (ANA) is a
professional organization for those who want to
further learn about US coins and currency.
PCGS are the only two TRUE independent
currency-grading services available. I highly
recommend these two companies for those of you who
want to get their currency certified and graded for
insurance purposes or simply, a peace of mind.
If you want to chat with other
collectors and dealers, visit the
Collectors Universe Currency Forum