Here’s a quick and dirty GreaseMonkey script to add COinS-PMH links to Google Books pages (formerly Google Print). It’s derived from Dan Chudnov’s series of scripts that do the same for various other sites, and it makes use of his Amazon proxy server. It’s dead simple: it grabs an ISBN out of the link to Amazon provided by Google and builds a COinS-PMH exactly the way Dan’s Amazon script does. Try it out by following Dan’s instructions, and installing booksgooglecomcoinspmhmi.user.js. (Note that coinssidebar.user.js must be installed last). Then visit Google Books and see some COinS.