Instead of having to open the "lightbox" to go to the WorldCat page for the work, this provides a link right there on the page. It uses that work's most popular ISBN.
I made this because I was frequently wanting to go to the WorldCat page for certain works/activities, and this was quicker than opening up the standard dialog (which remains as-is). I may be able to make something similar for other "quick links" should you need it (depending on how they work). Let me know.