I have a copy of CRY, THE BELOVED COUNTRY by Alan Paton. It has an "SBN" (not ISBN) listed on an interior page of 684-71863-4. This number is clearly short one digit, but if I put a "0" in front, the book indeed pulls up in PBS. Of course, the question pops up whether the book title, author, binding (paperback) and ISBN match exactly.

My question is - does the ISBN really match exactly if I have to add the "0" in front? It's not a book with a short ISBN as described in the help documents.

I'm not sure what to do with this one.

then as far as I'm concerned, it's the same book.

I'm sure there will be some that disagree but, I'm with John...I think it is ok to post like that.

yeah, it's okay...just make sure everything matches in the book listing

I say if the all the numbers but that 0 match and the other things match (author, title, binding) then you're OK to post it w/the ISBN. 

Adding the 0 to the SBN is how plenty of publishers handled the transition to 10-digit ISBN.  Some publishers have even "retrofitted" ISBNs to older books for identification purposes.  The SBN you've got plus the 0 in front is the ISBN for that book now.

I would reply explaining that I was certain that it's the same book, and didn't grab the ISBN to "make things easier".

Many thanks for all the answers.

Yes, it is the same book.  The first digit of the ISBN10 is either for the country in which it was published or the language in which it was published (I can't remember which). 

SBN + preceding 1 or 0 = current 10-digit ISBN, just as in the future when the 13-digit becomes most prevelant and the 10 is outdated, so now is the 9 digit outdated. Same book, just printed under the old numbering sytem. Post to the new numbering system.