Assistance is gratefully acknowledged from many individuals and institutions who have helped by sending ideas, comments, literature and photographs for this Bulletin, particularly:
Yvan Biot, University of East Anglia, England; K.J. Bligh, Dept. of Agriculture, Western Australia; P. Bolton, Hydraulics Research, Wallingford, England; N. Carigy, CSIRO Soils Laboratory, Canberra, Australia; A.L. Cogle, ICRISAT, India; A. Dickinson, Hydraulics Research, Wallingford, England; H.A. Elwell, AGRITEX, Harare, Zimbabwe; A. Grant, Silsoe College, Bedford; H. Gunston, Institute of Hydrology, Wallingford, England; R. Hairsine, CSIRO Soils Laboratory, Canberra, Australia; Karl Herweg, Soil Conservation Research Project, Ethiopia; P.I.A. Kinnell, CSIRO Soils Laboratory, Canberra, Australia; D. Lang, Soil Conservation Service of New South Wales, Australia; R.J. Loughran, University of Newcastle, New South Wales, Australia; D. McFarlane, Dept. of Agriculture, Western Australia; L.D. Meyer, National Sedimentation Laboratory, Oxford, Mississippi,; Alex Mitchell, Canterbury, Australia; D.M. Offermans, FAO Watershed Management Project, Nepal; Sir Charles Pereira, Teston, Kent; A. Profitt, Dept. of Agriculture, Western Australia; Jane Rickson, Silsoe College, England; E. Roose, ORSTOM, Montpellier, France; C.J. Rosewell, Soil Conservation Service of New South Wales, Australia; Adisak Sajjapongse, IBSRAM, Bangkok, Thailand; E. Seminario, FAO, Morocco; T.F. Shaxson, Greenhayes, Dorset, England; Michael Stocking, University of East Anglia; P.A. Taylor, Rock and Taylor Ltd., Warley, England; K.G. Tejwani, Land Use Consultants, New Delhi, India; C. Valentin, ORSTOM, Paris, France.
Many technical staff in FAO have also been most helpful, particularly D.W. Sanders, Senior Officer (Soil Conservation), Soil Resources, Management and Conservation Services, who proposed the bulletin and helped define its scope and objectives, and the officers in that service for technical advice.
On the production side, many photographs have been kindly loaned, and the source of each is acknowledged in the captions. Photos without a listed source are from the author's collection. Most of the diagrams were drawn by D. Mazzei. The author is most grateful to Linde Ovington Lee for ably taking the inumerable drafts and changes through her word-processor, and to administrative and secretarial staff of AGL for editorial help and advice, and for putting it all together.
