"It is mind boggling to research many books or sources to come up with a number. Why not a numbering committee????"
Don; There was such a committee appointed several years ago to develop a Universal Numbering System ... but not much collector or author enthusiasm for the idea was demonstrated and the project died on the vine. There were even a couple of public meetings held on this subject during two annual conventions that I am aware of which were lightly attended by probably less than a dozen participants.
If you want more information, contact the Robert Ginsburg of Connecticut (not the Florida Robert Ginsburg) ... and/or Ralph Pollack.