Frederick
Health and Human Services Library Consortium Libraries
National Institutes of Environmental Health Library (NIEHS) | Catalog
National Institute of Standards & Technology Library (NIST) | Catalog
Other Federal
Maryland
Johns Hopkins University Libraries | Catalog - includes Eisenhower Library, the Friedheim Library at Peabody Conservatory, the School of Advanced International Studies in Washington, D.C., and the Welch Medical Library.
SAILOR - is Maryland's Online Public Information Network, providing Maryland residents with access to Internet resources, including state and local government files.
University of Maryland at Baltimore, Health Sciences and Human Services Library | Catalog
Other
LibDex - Worldwide directory of library home pages and online catalogs.
WorldCat.org | Catalog - Allows free searching of the collections of libraries around the world.