Engineering Search Engines, Directories & Gateways
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EEVL: Internet Guide to Engineering, Mathematics, and Computing
"EEVL's mission is to provide access to quality networked engineering, mathematics and computing resources, and be the national focal point for online access to information in these subject.  It is an award-winning free service, created and run by a team of information specialists from a number of universities and institutions in the UK."
--Computing ejournal Search Engine (search content of over 60 free full text ejournals)
--Engineering ejournal Search Engine (search content of over 160 free full text ejournals)
--EEVL's ejournal Search Engine (search content of over 250 free full text ejournals)

EEVL Xtra
EEVL: Internet Guide to Engineering, Mathematics and Computing launched a new service called EEVL Xtra which "cross-searches over 20 collection relevant to engineering, mathematics and computing, including content from over 50 publishers and providers," including subject specific content from the hidden web which isn't indexed by Google or Google Scholar. (learn more)

Google Scholar 
Google is beta testing a new search engine that uses Google technology to search scholarly or peer reviewed literature including journal articles, preprints, books, thesis, abstracts and technical reports that are available on the Internet.  Full text may be available or search the CSULB Library (such as Locate Journals, search by journal title) for a copy.  Use Illiad:InterLibrary Loan to request items we do not have.

Engineering Web
Search over 100,000+ engineering and technical Web sites crawled, filtered and index by GlobalSpec.  Or use the more specialized searches.
Also try Material Properties, Tools and Useful Links, Product Announcements, Application Notes, Patents, Standards

Berkeley Search Engine Page
Quickly connect to multiple search engines such as Google, Teoma, Yahoo, Vivisimo, Librarian's Index to the Internet (LII), Informine, and About.com.
eFunda: Engineering Fundamentals
"Online destination for the engineering community, where working professionals can quickly find concise and reliable information to meet the majority of their daily reference needs." Subdivisions include materials, design center, processes, unit conversion, formulas, mathematics.

EngNet      
"Directory/Search Engine/Buyers Guide service aimed specifically at the Engineering Industry to enable engineers, technicians, tradesmen, etc. to find information and communicate effectively with suppliers in the Engineering Industry." Free searching, also fee-based content.

Librarians Index to the Internet: Science, Technology, & Computers
The mission of the Librarians' Index to the Internet is to provide a well-organized point of access for reliable, trustworthy, librarian-selected Internet resources, serving California, the nation and the world.

The National Academies: Engineering
"The National Academies perform an unparalleled public service by bringing together committees of experts in all areas of scientific and technical endeavor.  These experts serve pro bono to address critical national issues and give advice to the federal government and the public."
See also National Academies Press (3000+ books online free)

Scirus 
One of the most comprehensive Scientific search engines, produced by publisher Elsevier, it contains 167 million web pages.  It allows you to search many separate databases with one search such as ArXiv.org, Medline, Biomed Central, CogPrints, and the Computer Science Preprint Server. 

Find out more about Search Engines at Search Engine Watch, Search Engine Showdown and CSULB Library Search Engine Research Guide.