1.8) What is a "Pick" number?

  Refers to Albert Pick, author of the world paper money book
on general issues.  Nearly everyone who deals in world paper
uses this system for identifying notes.  Every note within a
country has a number associated with it, often shown in the
form "P-34" for general issues and "P-S34" for specialized
issues (volume 1).  Since every country has the same numbers,
a note is identified by country and Pick number.  For example,
USA P-480 is your garden variety series 1988 1 dollar bill.