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Simply the best science reference source available-the complete world of science on a single CD-ROM. This latest edition provides the user access to the authoritative text of the award-winning 20-volume McGraw-Hill Encyclopedia of science and Technology, 8th edition, and the entire McGraw-Hill Dictionary of Scientific and Technical Terms, 5th edition, with 122,600 definitions. Spectacular color images, superb animations, crystal-clear audio presentations, and interactive maps, allow exploration of scientific information in ways that transcend the printed page. The McGraw-Hill Multimedia Encyclopedia of Science and Technology Version 2.1 is fully updated to reflect the latest research by the world's top scientists and engineer ( 1999 ).