Originally Posted by drMerry
You have not seen dots between them?
You really expect me to remember
a possible 1 or 2 out of 900+
All I remember, was my attempt to Validate ISBN's in my collection Database (Paradox DOS), returned inconsistent results
All checking the (failed) entry against the book printing was it was not a 'fat fingering' problem
I vaguely remember some non-US published books having more than 1 ('Country specific') ISBN on the copyright page.