AccessScience McGraw Hill, from 2004+
Electronic version of the McGraw-Hill Encyclopedia of Science & Technology 10th edition plus content of all yearbooks, definitions and Science News.
McGraw-Hill Encyclopedia of Science & Technology, 10th ed. Reference collections in Firestone and Lewis Library Q121 .M3 2007. McGraw-Hill also puts out a Yearbook of Science & Technology. Reference Q121 .M13
Van Nostrand’s scientific encyclopedia 10th ed. Lewis and PPL Reference Q121 .V3 2008
Gale encyclopedia of science 4th ed. 2008
Examples of current specialized encyclopedias (some are both in print and available digitally):