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Hi Sharon. PBS is set up to list books primarily by ISBNs. If you cannot find a valid ISBN, the book should be posted here as a Book Without an ISBN. If the SBN does not convert to a valid ISBN, you would also need to post as a Book Without an ISBN.
Note about SBNs (and conversion to ISBNs)
SBN = 9 digit ISBNs were the original form. In the early 1970s a language digit was added to the start of the ISBN making them ten digits.
0 and 1 were allocated to English language publications. If you have a 9 digit number add a zero at the start. Alternatively, 9 digits are equally valid as this was the number given at publication, but is is common practice to add a zero as most automated systems require ten digits or more.
Be aware that from January 2007 thirteen digit ISBNs have been assigned to publications.
Do check CAREFULLY before posting by adding a 0 to the SBN.
In some cases it is a different edition--for example, I had one with a completely different introduction (which was relevant to the book). You need to double check the books information carefully before assuming just adding a 0 links to the proper book. It often does, but not always!
I think you need to be more careful than when listing by an ISBN simply because you are skirting the edge, and a receiver would be entirely justified in complaining if it was a different edition since it doesn't have an ISBN on the book.