The Cornell library has added access to the following encyclopedias, most of these have quarterly online updates:
Encyclopedia of Polymer Science and Technology, Wiley. Online resource covering 15 volumes. Includes the complete text of the third print edition, plus the classic second edition called the Encyclopedia of Polymer Science and Engineering.
Wiley Encyclopedia of Electrical and Electronics Engineering, edited by John G. Webster. 14,000 articles spanning 24 volumes; 64 categories.
Wiley Encyclopedia of Operations Research and Management Science, ed. By James J Cochran
Encyclopedia of Electrochemical Power Sources – ed. Jürgen Garche, Elsevier, online resource covering 5 volumes