The third, revised edition of Volume A of International Tables was published in November 1992. Its main feature is the incorporation of new diagrams for the tetragonal and, in particular, for the cubic space groups. Work on the remaining space-group diagrams is in progress; they will be incorporated into the fourth edition. Efforts towards a more detailed and improved presentation of the subgroups of space groups have continued throughout the triennium. A list of errata in the second edition (1987, 1989) appeared early in 1993 in Acta Crystallographica [(1993), A49, 592-593].
Th. Hahn, Editor
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