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 > Try a reference publication called The Market Share REporter.  Any
 > larger Library should have a copy.  THose data can be traced through thet
 > consumer and industrial buying power.

   While this approach is valid in some respects, its not going to pick
up certain elements of technology advancement.  Consider the sales of
the Linux operating system, these would surely not be in the Market
Share because they are primarily not marketed!  The same thing for free
web browsers for example.

   Dave