If I remember correctly the last digit of the ISBN, which is always one
digit by itself proceeded by a dash, is actually a kind of checksum for the
rest of the ISBN. X is a 10. Unfortunately I don't know how to make the
calculation necessary to make sure an ISBN is valid. I might be able to
get ahold of that information, though. There might be a visual basic
program on a computer around here that has some code for checking ISBN
validity, and if it can be found I can look at what it does.
Sarah Van Oosterwijck Assistive Technology Trainer http://home.earthlink.net/~netentity
This afternoon, I was doing preliminary validation work on a step 1 book and discovered something interesting which might prove of value. In one of my searches, I ended up at
www.thecheapestbook.com
where one can enter an isbn number to verify its validity or search for the book.
Well, I got back an invalid number, not a surprise, but the explanation was somewhat enlightening. A correct isbn number must contain, according to this, either 10 digits or 9 digits plus an "x". Perhaps this might explain why some attempts to supply an ISBN when submitting a book falls flat presumably due to the number failing to scan properly.
Mike
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