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I'm using a tag to let wishers know there's a copy w/ diff ISBN in the system. Here's an example:
I put the tag on the ISBN that wishers are wishing for letting them know when they look at it that there's a similar book available. I also put the ISBN of my book in the tag so they know what to look for.
My book has since been requested, so I changed the ISBN on the tag to zeroes so you could see how I did it.