1. Preliminary Experiments with a Method of Simulating a Soil with Controllable Shear Strength;Bailey;J. agric. Engng Res.,1961
2. The Shear Strength of Top Soils;Payne;Tech. Memo,1951
3. The Measurement of Soil Shear Strength;Osman;J. Terramechanics,1964
4. The N.I.A.E. Single Wheel Tester;Bailey;Natn. Inst. agric. Engng,1954
5. The magnetic Soil Trough Scale Effects;Berry;N.I.A.E. internal communication,1963