1. Anon (1971) ‘Standard Method of Test for Soundness of Aggregates by use of Sodium Sulphate or Magnesium Sulphate’ American Society for Testing Materials, ASTM C88-71: 49–53
2. Anon (1977) ‘The description of rock masses for engineering purposes’ Geological Society Engineering Group, Working Party Report, Q. J. Engng. Geol., 10, 355–388
3. Anon (1981a) ‘Rock and soil description and classification for engineering geological mapping. International Association of Engineering Geology Commission on Engineering Geological Mapping, Bull. In. Ass. Engng. Geol., 24, 235–274
4. Anon (1981b) Basic geotechnical description of rock masses, International Society for Rock Mechanics, Commission on the Classification of Rocks and Rock Masses, Int. J. Rock Mech. Min. Sci. & Geomech. Abstr., 18, 85–110
5. Anon (1981c) Code of Practice for Site Investigation, BS 5930, British Standards Institutions, London