Paging Mr. Dewey was my first shot at a library hide. Over the course of 16 months Mr. Dewey had 31 visitors and picked up a local award nomination. That's not too shabby considering it took a good hour to solve.
Here's how Mr. Dewey worked: A commemorative plaque in the landscape was used to decode a call number for a book in the reference section. The book was actually a binder with many copies of this worksheet. A variety of really cool reference books were used to complete the worksheet and find the three digit combination for the lock on a bonafied treasure chest at the reference desk.
Benefits of a library cache: the weather inside is always perfect, no one can steal the cache, the swag tends to be great, the container doesn't have to keep out weather or animals, and it helps educate the public about geocaching. Today Mr. Dewey was replaced by Mr. Fishbottom. Wish him luck!