This is the twelfth article on science, technology, and medicine (STM) databases in a continuing series of articles summarizing and commenting on new database products. Two companion articles, onecovering social sciences, humanities, news, and general (SSH) (Online & CD-ROM Review, vol. 22, no. 5) and the other covering business and law (BSL) (Online & CD-ROM Review, vol. 22, no. 6) will appear in the next issues of this journal. These articles are based on the newly appearing database products in the Gale Directory of Databases. The Gale Directory of Databases (GDD) was created in January 1993 by merging Computer-Readable Databases: A Directory and Data Sourcebook (CRD) together with the Directory of Online Databases (DOD) and the Directory of Portable Databases (DPD).
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