1. Proceedings of the Third International Drumlin Symposium,1992
2. A theory of drumlin formation by subglacial sediment deformation;Boulton,1987
3. Groundwater flow beneath ice sheets, Part 1. Large-scale patterns;Boulton;Quat. Sci. Revs.,1995
4. Subglacial Processes, Sediments and Landforms,1994
5. Drumlin Symposium,1987