The links listed below will provide you with much more information on various research topics, and they’ll direct you to finding those resources online in most cases.
Digital Librarian: Margaret Vail Anderson, a librarian in Cortland, New York, manages this list of categorized Web sites that’s very similar to the Yahoo! Directory.
Digital Library Federation Collections Registry: You’ll find a web-searchable database of nearly 300 public domain online digital collections. The Digital Library Federation (DLF) is a consortium of libraries and related agencies that are pioneering in the use of electronic-information technologies to extend their collections and services.
Digital Library for International Research: The Council of American Overseas Research Centers (CAORC) and the American Institute for Yemeni Studies (AIYS) sponsor DLIR. They provide on-line public access catalog containing the records of all the holdings in all participating libraries. They also deliver important bibliographic and full-text primary and secondary source information from all CAORC member centers, covering both print collections and research collections in other media.
ibiblio: ibiblio.org is a “collection of collections,” including links to sites that contain software, music, literature, art, history, science, politics, and cultural studies. ibiblio.org is a collaboration between the Center for the Public Domain and the University of North Carolina at Chapel Hill.
Library Without Walls: Library Without Walls customers use the Los Alamos National Laboratory’s digital library technology to access a wealth of scientific and technical resources worldwide from the desktop, anytime, anywhere.
National Transportation Library: The National Transportation Library works to bring together transportation libraries, information centers and information resource professionals to improve access to transportation resources and develop transportation knowledge networks. Your searches will take you to Web sites that focus on trains, automobiles, etc.
OAIster: OAIster is a union catalog of digital resources. They provide access to these digital resources by “harvesting” their descriptive metadata (records) using OAI-PMH (the Open Archives Initiative Protocol for Metadata Harvesting), so you can use phrase to find documents rather than remember titles and authors.
The British Columbia Digital Library: This is a comprehensive guide to digital library collections, primarily text-based ones, and digital library construction technology in BC and around the world. Some databases are out of date, but you can still use these collections for direction.