National Watch and Clock Library
National Watch and Clock Library is one of of the world's preeminent horological libraries and is located in Columbia, PA, USA. It is operated by the National Association of Watch & Clocks Collectors and is a sister institution to the National Watch and Clock Museum.
The library is open to the public, who is invited to use the collection on premises, but will lend books only to members of NAWCC.
Its collection covers material on timekeeping, time and timekeepers in a dozen different languages. In addition to its book collection of about 10'000 titles (some of them dating back to the 16th century), they have over 1000 different videos (both VCR and DVD formats), a comprehensive collection of horological periodicals (both current in historic) from around the world, many thousand historic catalogs of watches and clocks, as well a masses of archival material chronicling the history of timekeepers.