Invisible Web Search Engines

All Search Engines Argus Clearinghouse Beaucoup.com The Big Hub BUBL Complete Planet Digital Librarian Direct Search Find Articles.com Government Information Infomine Multiple Database Search Internet Public Library

Invisible Web Invisible Web Directory Librarians' Index to the Internet Libraryspot.com Look Off Lycos Directory of Searchable Databases Profusion Science.gov Search Bug Search Engine Colossus Subject Directory of Search Engines WWW Virtual Library

From: Ru, Yanbo and Horowitz, Ellis. (2005). Indexing the invisible web: a survey. Online Information Review, 29(3):249-265. On-line