Link directly to an ISBN/ISSN [OCLC - Open WorldCat program]

This is the answer to my prayers for some way of linking to books other than sending people to Amazon.
Link directly to an ISBN/ISSN [OCLC - Open WorldCat program].
It has limitations of course: there seem to be very few UK libraries taking part. So using OCLC's example search for the Da Vinci Code (though I'm sure no reader of this blog would want to), it only found a copy in one library,  at US Air Force Europe, RAF Lakenheath, which I suspect is not open to the public.
But if there were to be wide participation in this, particularly by public libraries, it could be useful beyond words. When the database includes sufficient useful UK libraries, I'll set about changing my sidebar typelists to use thsi rather than Amazon.