Libraries and geocaching

Well, I guess it would make sense for me to post some projects and ideas I've come across (mainly in the US) that combine libraries and geocaching.

• The University of Notre Dame in Indiana came up with "Caching in at the Library" for their orientation programme for first year students.

• The Toledo-Lucas County Public Library in Ohio hosted a geocaching event as part of National Library Week. 

• A librarian at Shoshone Public Library in Idaho has hidden a cache in the library as part of their summer reading programme.

There are a copule of caches I've come across (but not found) that involve visiting a library or using Dewey Decimal Classification to solve a puzzle.