This issue's cover: A surface crust of various soil types: clayey, kaolinitic (top), clayey, non-phyllosilicate (bottom), clayey, montmorillonitic (middle right), and sandy loam, montmorillonitic (middle left). Please see `Soil Mineralogy and texture effects on crust micromorphology, infiltration, and erosion' by I.I.C. Wakindiki and M. Ben-Hur, p. 897-905.