WorldCat (ISU Community only) - a catalog of materials owned by 72,000 libraries in 171 countries.

Center for Research Libraries Online Catalog - a specialized library in Chicago with a large collection of rare research materials.

Greater Western Libraries Alliance - provides links to websites of a group of 29 research libraries located in the greater Midwest & Western U.S.

Additional library catalogs can be located using LibDex (17,800 libraries) or LibWeb (only 6,100 libraries but easier to browse by "type of library"). A listing of Iowa libraries and their catalogs is also available.

Many of the materials owned by other libraries can be obtained through Interlibrary Loan by filling out an ILL request form. Interlibrary Loan allows you to request materials (such as books or copies of journal articles) from other libraries that the ISU Library does not own. Be sure to consult the Interlibrary Loan page for more information on this process.