The material for the fourth, revised edition of Volume A was submitted to the Technical Editor in January 1994; first proofs were read in September, second proofs in December 1994. The new edition is scheduled for publication in the spring of 1995. It will contain a complete set of new diagrams for the plane groups and the space groups, as well as new explanatory diagrams in Section 2.6. Furthermore, this edition will contain the new graphical and printed symbols for the `double glide plane e', introduced by the IUCr in 1992. This has necessitated major changes in Section 1. A list of errata to the third edition of Volume A (1992) will appear in Acta Cryst. (1995), A51, 592-595.
Th. Hahn, Editor
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