We are grateful to acknowledge the help, material and constructive criticism contributed by many workers in a wide range of areas of geomorphology
during the preparation of this manual. In particular we are indebted to V. R. Baker, R. Beck, G. S. Boulton, D. Brunsden, M. J. Clark, R. U. Cooke, J. C. Doornkamp, E. M. Durrance, A. S. Goudie, K. J. Gregory, C. Hardwick, K. Hewitt, I. P. Jolliffe, B. Juel-Jensen, J. Mattsson,
M. J. Selby, G. S. P. Thomas, C. R. Thorne, J. B. Thornes, A. Warren and W. B. Whalley. Finally, thanks to Gill and Paula, without whose help and forbearance this book could not have been written.