1. Krumbein, W. C., Bull. Amer. Assoc. Petrol. Geol., 40, 2163 (1956).
2. Haggett, P., and Chorley, R. J., in Frontiers in Geographical Teaching, edit. by Chorley, R. J., and Haggett, P. (Methuen and Co., Ltd., London) (in the press).
3. Kennedy, J. F., and Brooks, N. H., Laboratory Study of an Alluvial Stream at Constant Discharge (Jackson, Mississippi, 1963).
4. Schumm, S. A., and Lichty, R. W., Amer. J. Sci. (in the press).
5. Chorley, R. J., U.S. Geol. Survey, Prof. Paper 500–B (1962).