Citation: Richards Keith, The magnitude-frequency concept in fluvial geomorphology: a component of a degenerating research programme?, Zeitschrift fur Geomorphologie. Supplementband Zeitschrift fur Geomorphologie. Supplement;Zeitschrift fur Geomorphologie. Supplementary issue Annals of geomorphology. Supplement;Annales de geomorphologie. Supplement, 115, 1999, pp. 1-18