1. Standard test method for particle-size analysis of soils;ASTM D 422-63,2003
2. Standard test method for shrinkage factors of soils by the mercury method;ASTM D 427-98,2003
3. Standard test method for laboratory compaction characteristics of soil using standard effort;ASTM D 698-00a,2003
4. Standard test methods for liquid limit, plastic limit, and plasticity index of soils;ASTM D 4318-00,2003
5. The micromorphological soil-investigation work of Dr. Lafeber;Barton,1974