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SEARCH ENGINES AND SUBJECT DIRECTORIES
SEARCH ENGINES
Newest and most efficient search engines are presented first as Second Generation Engines; the best of the older search engines are presented as First Generation, mainly because they offer results only by term relevancy.
Second Generation: (Results presented by concept, document type, web site, popularity, etc.
MetaSearch:
First Generation: (Using term relevancy to rank results)
Academic and Professional Directories
Commercial Portals: