The content of Volume E has been finalized. It consists of two parts:
Part 1: Subperiodic Group Tables: Frieze Groups, Rod Groups and Layer Groups.
Part 2: Scanning of Space Groups, i.e. determining the layer-group symmetries of planes which transect a crystal.
Material originally to be included, concerning subperiodic groups as factor groups of reducible space groups, has been postponed for inclusion in a subsequent edition of this volume. Final drafts are being written to bring about consistency of notation, terminology and style throughout the volume
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