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Virtual Reference - Search Engines, Subject Directories & Metacrawlers
- Search Engines
- Google U.S. Government Search
- Google News
- Google Images
- Google Maps
- Google Scholar
Search Journal Articles (results may or may not be full text)
- Google Books
Search Full-Text of Books (results may or may not be full text)
- Google Blog Search
Combined Search Engine and Internet Directory
Search Engine with enhanced guided search features
- Subject Directories
- Librarians' Index to the Internet
A searchable, annotated subject directory of tens of thousands of web sites
that meet various selection criteria.
A directory of scholarly Internet Resource Collections
- RDN: Resource Discovery Network
Gathers resources which are carefully selected, indexed and described
by specialists in partner institutions... comprised of over
seventy educational and research organisations, including the
Natural History Museum and the British Library.
A directory of internet resources managed by individuals with expertise
in specific subject areas.
Mamma simultaneously queries numerous search engines and organizes the
results into a uniform format and presents them by relevance and source.
Searches multiple search engines and provides combined results, as well
as the capability to separate out results by engine and see which
results are unique to the various search engines.
Clusty takes search results and clusters them into groups of similar
results, allowing users to quickly focus their search.