The Fourth, Revised Edition of Volume A was published in March 1995. It contains new diagrams for all plane groups and space groups, as well as new explanatory diagrams in Section 2.6. Furthermore, this edition contains for 17 space groups the new graphical and printed symbols for the `double glide plane e', introduced in an IUCr Commission on Crystallographic Nomenclature Report in 1992. This has led to major changes in Section 1 and to modifications of the Hermann-Mauguin symbols for five space groups (Nos. 39, 41, 64, 67, 68).
Early in 1996, the material for a Corrected Reprint of Volume A, as well as for the Fourth Edition of the Brief Teaching Edition of Volume A was prepared.
A list of Corrigenda and Addenda to the Third, Revised Edition (1992) of Volume A appeared in Acta Cryst. (1995), A51, 592-595.
Th. Hahn, Editor
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