Holidays are silver, blue, and white at the library

Happy Holidays from the staff at the Oak Bluffs Public Library. We have decorated the library with all recycled, reused, and re-purposed materials. Our Christmas trees have received lots of attention. We made them out of old paperback books. See if you can tell what publication we used to make the large trees. Hint: think close to home.
We hope to see you during the holidays.