THE REVISED EDITION OF VOLUME C AND PLANS FOR ELECTRONIC DISSEMINATION. E. Prince, Department of Materials and Nuclear Engineering, University of Maryland, College Park, MD 20742, USA, and Reactor Radiation Division* , National Institute of Standards and Technology, Gaithersburg, MD 20899, USA

Preparations for the publication of a revised and expanded edition of Volume C of the International Tables for Crystallography were about 85% complete at the time of the death of the previous editor, A. J. C. Wilson. This work has been continued by the current editor, and it is expected that the revised edition will be published in the late spring of 1997. It was recognized right from the beginning, however, that the material in this volume, Mathematical, Physical and Chemical Tables, was subject to rapid obsolescence due to ongoing experimental and theoretical research. This, along with the revolution in information technology during the past decade, makes it necessary to make as much as possible of this information be available in electronic form. It will then be possible not only to issue more frequent revisions at lower cost but also to distribute up to date information via the Internet and the World Wide Web. An effort is therefore being directed toward locating any existing electronic files and converting them to a uniform format that can be viewed or printed on a wide variety of platforms and also to ensuring that any new material is maintained inmachine-readable form.