Rigid Plastic Theory in Tillage (Theory and Practice of Cultivations)
Richard J. Godwin presented this lecture as part of the 2009 Dr. William R. Gill Memorial Session as part of the launch of the ASABE Advances in Soil Dynamics Volume 3. The lecture provides a review and develops the theory in its historical context and timeline.
Advances%20in%20Soil%20Dynamics%20Bill%20Gill%20Memorial%20lecture%20by%20Richard%20Godwin.pdf
Advances in Soil Dynamics Bill Gill Memorial lecture by Richard Godwin.pdf
Papers and .xls files (the companion cd files) linked to this lecture can be found listed under Chapter 3, Tillage, on the ASABE web page for *Advances in Soil Dynamics* Volume 3.