The proposal for a Volume E was presented to and accepted by the Executive Committee at the time of the Bordeaux Congress. Volume E consists of three parts: Part 1 is a guide to and symmetry tables of the subperiodic groups: Frieze Groups, Rod Groups and Layer Groups. Parts 2 and 3 deal with the relationship between subperiodic groups and space groups. Subperiodic groups are considered as factor groups of space groups in Part 2, and as subgroups of space groups in Part 3. A document entitled Nomenclature, Symbols and Classification of the Subperiodic Groups, containing the standards for the nomenclature, symbols and classifications used in Volume E, was written by the authors. This was submitted to and approved by the Commission on Crystallographic Nomenclature. An Abstract will appear in Acta Cryst. [(1993), A49, 594].
Part 1 has been read by Professor Hahn for consistency with Volume A in content, style and presentation. Comments by Professor Hahn have been incorporated, and Part 1 is complete except for professional redrawing of diagrams and a final section comparing the numerous sets of symbols of the subperiodic groups. A draft of Part 2 has been written and of Part 3 is partially done. It is expected that all parts will be completed in 1993.
V. Kopsky and D. B. Litvin, Editors
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