1. The preparation of maps and plans in terms of engineering geology. Engineering Group of the Geological Society Working Party Report.;Anon;Quarterly Journal of Engineering Geology,,1972
2. On the investigation of the physical properties of soils and on the plasticity of clays.;Int. Mitt fur Bodenkunde,,1911
3. Attewell, P. B. & Farmer, I. W. 1976. Principles of Engineering Geology. Chapman & Hall, London
4. Bates, R. L. & Jackson, J. A. 1987. Glossary of Geology. American Geological Institute, Virginia
5. The point-load test in geotechnical practice