South Dakota

• SDLN Catalog: South Dakota's statewide library catalog (the old PALS version was replaced by the new Aleph version on March 31, 2005)
• SD Library websites/homepages SD libraries with homepages (includes links)
• SDLN Member Library Directory All SD libraries (has no links) (via SDLN)

Regional

• ODIN North Dakota statewide library catalog (PALS)
• ND State University Libraries (PALS)
• MnSCU/PALS catalog of the Minnesota State Colleges and Universities Statewide Automated Library System (MnSCU/PALS)
• TdS Traverse des Sioux Library System provides a single catalog for 45 public libraries in 9 counties of southcentral Minnesota (PALS)
• University of Minnesota Libraries
• MnLink Minnesota statewide virtual library

National/International

• Library of Congress
• LibDex, the Library Index keyword search a directory of 13,368 libraries (includes website & OPAC addresses)
• 50 State Libraries homepages of all State Libraries in the US