Acknowledgements, Chronological Table of reprinted articles and chapters, General Editor's preface, Introduction, PART 1: Dunes, 1. On the formation of sand-dunes, 2. The movement of desert sand, 3. Dry and humid morphology in the Western Erg, 4. Ergs, 5. Factors determining desert dune type, 6. New models for the formation of linear sand dunes, 7. Eolian dunes: computer simulations and attractor interpretation, PART 2: Dust, 8. Dynamics of wind erosion: I. Nature of movement of soil by wind, 9. Dynamics of wind erosion: III. The transport capacity of the wind, 10. Atmospheric transport of soil dust from Africa to South America, 11. Effect of drought on dust production in the Sahel, PART 3: Fluvial and slope processes, 12. Sheetflood erosion, 13. The geographical cycle in an arid climate, 14. Deflative scheme of the geographic cycle in an arid climate, 15. The influence of surface properties on flow and erosion processes on debris covered slopes in an arid area, PART 4: Weathering and surface materials, 16. Geology of Southern African calcretes: 1. Terminology, description, macrofeatures, and classification, 17. The insolation hypothesis of rock weathering, 18. Salt weathering, a neglected geological erosive agent in coastal and arid environments, 19. Origin of the coastal flats, the Sabkha, of the Trucial coast, Persian Gulf, PART 5: Earth and Mars, 20. Morphology and distribution of common 'sand' dunes on Mars: comparison with the Earth, 21. Sapping processes and the development of theater-headed valley networks on the Colorado Plateau, PART 6: Climate change, 22. The ancient erg of Hausaland, and similar formations on the south side of the Sahara, 23. Global maps of lake-level fluctuations since 30,000 yr B.P.,