LIBRIS is the Swedish national library catalog and directory that has existed since 1970. It contains over 6 million bibliographic records and links data about 175 libraries. LIBRIS recently transitioned to providing data as Linked Open Data to better integrate with the web. By exposing bibliographic records and authority files as structured data with HTTP URIs and links to vocabularies, LIBRIS allows its data to be queried and used freely on the web rather than through isolated APIs. This transition positions LIBRIS to develop more links to external datasets and take advantage of the network effects of the semantic web.