LINK

puts a small yellow box in the corner of your Google Print book search. The box includes a book title and a link to the library system's search results. When clicked, a new browser tab is created containing the library's lookup page with the book's location and status. The script also linkifies the library names on the latter page, to point to the library's street map, hours and phone page. This GM script acts on 2 completely separate pages. Should be relatively straightforward to alter for your own local library's book search API and map and hours.