Hi,
  I'm looking for information on Blue Books, i.e. used equipment
pricing guides.  Specifically:
- who all makes blue books, e.g. Kelly Blue Book, Orion (a bit of
history on each would be a plus)
- what market segments they cover, e.g. automobiles, industrial equipment, etc.
- where from they get their pricing data (detail here is good)
- how many pricing entries are in each book
- blue book products pricing structures, i.e. what exactly are they
selling, e.g. $X for a CD-ROM, $3.99/net lookup, etc.
- and finally, what is the total market for blue book information (any
breakdown here would be good).

Thank You.