LibDex  
   World index of library sites with over 18,000 database entries. Includes a list of libraries by catalog vendor.
   http://www.libdex.com/

The WWW Library Directory  
   Searchable directory of over 8,000 library and library-related sites worldwide arranged by countries. Includes a US section sorted by states.
   http://www.webpan.com/msauers/libdir/

Libweb  
   Searchable and categorized links to over 6,000 pages from libraries in over 100 countries, including academic, public and national libraries worldwide; library organizations and consortia; and related sites.
   http://sunsite.berkeley.edu/Libweb/

School Libraries on the Web  
   Worldwide directory of school library sites. The US categories also list related library organizations.
   http://www.sldirectory.com/

Lib Web Cats  
   Searchable database of over 5,000 library sites worldwide. Listings include mailing addresses and links to online catalogs.
   http://www.librarytechnology.org/libwebcats/

ALiNUS  
   Searchable directory of academic library newsletters in the United States.
   http://www.snhu.edu/Southern_New_Hampshire_University/Library/Electronic_Resources/ALiNUS_Home.html

Libraries of the World and their Catalogues  
   Links to national, academic and public libraries and their catalogues. Compiled by Sylvia Milne, a retired librarian.
   http://www.sylviamilne.btinternet.co.uk/plucked/libcats.htm

ISBNDB  
   Multilingual database of international standard book numbers. Offers the possibility to investigate by category.
   http://isbndb.com/

Libraries on the Worldwide Web  
   Alphabetically arranged index of library resources including public, research and state libraries as well as national archives.
   http://www.123world.com/libraries/

Library and Related Resources  
   List of references indexed by topics like public, school and national libraries. Also includes sections about organisations and science resources.
   http://www.ex.ac.uk/library/wwwlibs.html

National Library Catalogues Worldwide  
   Index of libraries with detailed descriptions about the handling of the search interfaces sorted by countries.
   http://www.library.uq.edu.au/ssah/jeast/

NLS/BPH: Reference Directories Index Page  
   A list of directories provided by the U.S. Library of Congress, National Library Service for the Blind and Physically Handicapped.
   http://www.loc.gov/nls/reference/directories/

UNESCO Libraries Portal  
   Searchable directory for libraries worldwide sorted by category. Includes links to libraries of secondary schools, universities and other tertiary institutions.
   http://www.unesco.org/webworld/portal_bib/Libraries/

Library and Information Science  
   IFLA list of world wide web accessible libraries worldwide sorted by countries.
   http://www.ifla.org/II/natlibs.htm

Global Reach  
   Searchable database which shows the involvement of librarians and libraries in international library activities.
   https://cs.ala.org/global/

Internet Quick Reference Shelf: Library Resources  
   Collection of links presented by the University of Indiana categorized by topics.
   http://www.indiana.edu/~librcsd/internet/Library_Resources/

Law Libraries Worldwide  
   Chan Robles & Associates provides links to major law libraries around the world.
   http://www.chanrobles.com/lawlib1.htm

Veterinary Medicine Libraries  
   Guide to veterinary medicine libraries worldwide sorted by countries.
   http://duke.usask.ca/~ladd/vet_libraries.html

Libraries and Archives  
   Index of links to universities and libraries worldwide as well as references to various directories.
   http://www.uky.edu/Subject/libraries.html

Bookwire  
   Descriptive listing of US libraries alphabetically and by state, as well as an index of Asian, European, Canadian and special libraries.
   http://www.bookwire.com/bookwire/libraries/libraries.html

List of Judaica Library Websites  
   Alphabetically sorted links to jewish library websites.
   http://www.angelfire.com/on2/smbergson/jlibraries.htm

US State Library Links  
   List of US libraries sorted alphabetically and by state.
   http://www.angelfire.com/ks/windshipgenhelp/statelib.html

Bishop Library Index  
   Links to worldwide libraries, mostly with descriptions of the specific websites by Kenneth Bishop.
   http://members.lycos.co.uk/kbishoplib/

Libraries & Archives  
   List of references structured by topics as internet and science libraries.
   http://book-smith.tripod.com/bml-libraries.html

LibraryBug  
   Site offers data and facts on public libraries in the United States.
   http://www.librarybug.org