Why can't paper be as easy as coins?
I am a coin collector but my son has opted for collecting currency. I am trying to help him find Friedberg numbers for his bills.
In looking at the list of Friedberg numbers for the $1 Federal Reserve Notes 2003A series, there seems to be twice as many numbers as there are bills, not counting the * designation.
Are there two different types of bills in the series? If there is a difference, what is it?
Addendum: I just figured out about the bills prin