On Tue, 4 Sep 2012, Ted P Gemberling wrote:

> If I know two copies with the same copyright date are typographically 
> identical ...

  That would be "practically" impossible to determine.

> I'm guessing that publishers know what date something was printed and 
> what date it was copyrighted, but if you asked them what the publication 
> date was, they'd wonder what you were asking.

  Publisher's Web pages often give very specific "publication" dates, and 
they often differ for hardback and paperback iterations of material with 
the same "copyright."

Cheers!

jgm

  John G. Marr
  Cataloger
  CDS, UL
  Univ. of New Mexico
  Albuquerque, NM 87131
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