1. Theory of Land Locomotion;Bekker,1956
2. Model Testing of Earthmoving Equipment;Cohron,1961
3. The Tillage Energy of a Vibrating Tillage Tool;Hendrick,1962
4. The Influence of Speed on Draft of a Simple Tillage Tool from Model Studies;Rowe,1959
5. Einige Grundlagen für eine Landtechnische Bodenmechanik;Sohne,1956