Back when Through the Open Window came out, I sent copies to both the East Longmeadow and Springfield (MA) Main Library. The East Longmeadow library plays a prominent role in the story and the main characters also take a visit to the Springfield Quadrangle (of which the Springfield Library is a part). I had checked a while later and the book wasn't listed in the on-line catalog so I figured both libraries had simply given the book away. I hoped they found a good home.
Fast-forward three years. Just for fun, I plugged my name into the Cwmars catalog and lo and behold, there it was at the Springfield Library. Of course, I needed to go take a trip to visit my book. I may never see one of my books in a bookstore, but I got to see one at a library! I even checked it out! (I plan to bring it back tomorrow.)