1. The characterization of slope positions and their influence on the total nitrogen content of a few virgin soils of western Iowa;Aandahl,1948
2. A critique of current methods in hydrologic systems investigations;Amorocho;Trans. Am. Geophys. Union,1964
3. More is different;Anderson;Science,1972
4. Physical Principles of Water Percolation and Seepage;Bear,1968
5. Die pedogenetische Deutung einer Catena durch die Untersuchung der Bodendynamik;Blume,1968