Online electronic encyclopedias

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http://innopac.library.drexel.edu/search/X
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use 'encyclopedia*' or 'handbook*'as one keyword; limit using 'All Electronic Resources'
You can also use specific keywords such as 'chemical', for example, to find any chemical related encyclopedias or handbooks.
Some Science and Engineering related encyclopedias that you can find are:

Ullmann's encyclopedia of industrial chemistry [electronic resource]
Encyclopedia of biomaterials and biomedical engineering [electronic resource]
Encyclopedia of medical genomics and proteomics [electronic resource] / edited by Jurgen Fuchs, Maur
The complete book of spaceflight [electronic resource] : from Apollo 1 to zero gravity / David Darli
Encyclopedia of optical engineering [electronic resource] / edited by Ronald G. Driggers.
Encyclopedia of agrochemicals [electronic resource] / Jack R. Plimmer, Derek W. Gammon, Nancy N. Rag
Encyclopedia of materials, parts, and finishes [electronic resource] / Mel Schwartz.
Encyclopedia of smart materials [electronic resource] / [edited by] Mel Schwartz.
Encyclopedia of chemical physics and physical chemistry [electronic resource] / edited by John H. Mo
Encyclopedia of materials [electronic resource] : science and technology / editors in chief, by K.H.
AccessScience @ McGraw-Hill : [electronic resource] the McGraw-Hill encyclopedia of science and tech
Concise encyclopedia of plastics [electronic resource] / Donald V. Rosato, Marlene G. Rosato, Domini
Encyclopedia of separation science [electronic resource]/ editor in chief, Ian D. Wilson ; managing
Encyclopedia of bioprocess technology [electronic resource] : fermentation, biocatalysis, and biosep
The encyclopedia of molecular biology [electronic resource] / Thomas E. Creighton.
Encyclopedia of cryptology [electronic resource] / David E. Newton.
Encyclopedia of life sciences [electronic resource].
Kirk-Othmer encyclopedia of chemical technology [electronic resource] / executive editor, Jacqueline
Encyclopedia of polymer science and technology [electronic resource] / editorial board, Herman F. Ma

Plus many more!