Frederick Community College Library | Catalog
Frederick County Public Libraries | Catalog
Hood College Library
National Institutes of Environmental Health Library (NIEHS) | Catalog
National Institutes of Health Library | NIH Library Catalog
National Institute of Standards & Technology Library (NIST) | Catalog
Library of Congress (LC) | Catalog
National Agricultural Library (NAL) | Catalog
National Library of Medicine (NLM) | Catalog
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
University of Maryland, College Park Libraries | Catalog
LibDex - Worldwide directory of library home pages and online catalogs.
New York Public Library | Catalog
WorldCat.org - Allows free searching of the collections of libraries around the world.