See also:

• Reference: Libraries: Directories  (24)

• Libdex - A worldwide directory of library homepages, web-based OPACs, Friends of the Library pages, and library e-commerce affiliate links.
• Libraries of the World and Their Catalogues - Links to national, academic and public libraries and their catalogues.
• lib-web-cats - Searchable database of over 4,500 library web sites and online catalogs worldwide.

ODP - Open Directory Project : Help build the most comprehensive human-reviewed directory of the web.