I have 3 Grolier Books of Knowledge that I had planned to post but I have a few questions first.

One of them has an ISBN, but the system does not recognize it as a valid ISBN (The New Book of Knowledge Annual 1976).   The other 2 do not have ISBN's that I have been able to find (The Book of Knowledge Annual 1961 & 1962).  

I tried to see if any other Books of Knowledge have been listed in the system and it looks like some of the newer ones have been listed, but none of the vintage. 

All 3 are in excellent condition.  So are they postable?  And where should I post them?  Why is the system not accepting the ISBN on the one book that has one?

Any help appreciated.

Tory

ISBNs can be fickle.  By searching for the ISBN to the first volume the PBS system will (as far as I'm concerned) automatically seek out that information, to add it to the database.  (edited to add: ok, it might not be "automatic", but it's just as good!)  You might check it a second time and find the listing has suddenly appeared.  However, publishing companies do many things differently with their ISBN's, and it's possible that yours has been reused, or disused, or some such nonsense. To be honest, if a listing for the ISBN does not appear, you'd probably be best served by simply entering the books without ISBN's, which is an option on the Post Books page.  The two volumes from the 60's won't have ISBN's because the ISBN system didn't really come into use until the late 60's/early 70's.  Entering books without ISBN's can be fun, and it is a task not without its own unique perks.  Your books will be the only books with those listings.  You get the distinct satisfaction of entering the information yourself, which in all seriousness comes with a small dose of pride once the job is complete.  Lastly, you get to enjoy the attention of the subset of bibliophile Swappers that go wild for vintage books such as yours.  I'm sure that an advertising post in the Book Bazaar, when combined with properly detailed listings, will have the books ordered and mailed long before they might have even been looked at were they posted with ISBN's.  So take heart, and if you need a little help with your task, also consider taking a look at this Help Center document:  How do I post a book without an ISBN?

Hope that helps :)  Happy Swapping!!!

Thanks for the info.  I've had to add several of my vinage books to the system because they don't have ISBNs at all, so I'm getting familiar with the process.  I ever scan the book covers and add it with my listing.  I was just wondering since some do have ISBN and weren't found

Thanks again,

Tory