Welsh Journals

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GREGORY, K. J. and WALLING, D. E. (1968) The variation of drainage density within a catchment. Bull. Int. Assoc. Sci. Hyd. 13, 61-8. GREGORY, K. J. and WALLING, D. E. (1973) Drainage Basin Form and Process. Arnold, 41, 48, 51-2. JONES, A. (1971) Soil piping and stream channel initiation. Water Resources Res. 7, 602-10. KIRKBY, M. J. (1969) Erosion by water on hillslopes, in: Water, Earth andMan (ed. R. J. CHORLEY) Methuen, 231-2. LEWIN, J., CRYER, R. and HARRISON, D. I. (1974) Sources for sedi- ments and solutes in Mid-Wales, in: Fluvial Processes in Instrumented Watersheds (eds. K. J. GREGORY and D. E. WALLING) Special Publication 6, Institute of British Geographers, 74. LEWIS, C. A. (1970) The upper Wye and Usk regions, in: The Glaciations of Wales and Adjoining Regions (ed. C. A. LEWIS) Longman, 154, 163-4. LEOPOLD, L. B., WOLMAN, M. G. and MILLER, J. P. (1964) Fluvial Processes in Geomorphology. W. H. Freeman & Co., 410-4. NEWSON, M. D. (1975) Mapwork for flood studies: Part 1 Selection and derivation of indices. Natural Environment Research Council, Institute of Hydrology Rept. 25, 38-43. NEWSON, M. D. (1976A) The physiography, deposits and vegetation of the Plynlimon catchments. Natural Environment Research Council, Institute of Hydrology Rept. 30, 15, 20. NEWSON, M. D. (1976B) Soil piping in upland Wales: a call for more information. Cambria, 3(1), 35. PRINGLE, J. and GEORGE, T. N. (1961) British Regional Geology: South Wales. H.M.S.O., 49 STAGG, M. D. (1973) Storm runoff in a small catchment in the Mendip Hills. Unpub. M.Sc. thesis University of Bristol, 28, 42, 45. WATSON, E. (1967) The geomorphological factor in upland soil form- ation, in: Upland Soils (ed. D. JENKINS) Welsh Soils Discussion Group Rept. 8, 16-17. WEYMAN, D. R. (1970) Throughflow on hillslopes and its relation to the stream hydrograph. Internat. Assoc. Sci. Hyd. Bull. 15, 25-33. Acknowledgement The air photographs used in the analysis were purchased from the Air Photographs Unit, Department of the Environment.