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Cover: Two-dimensional experimental data and modeling show a "drainage wedge" (outlined by the white line in the photograph) that was associated with the propagation of a surfactant plume within the capillary fringe. Eric J. Henry and James E. Smith discuss surfactant effects on unsaturated flow and transport in "Surfactant-Induced Flow Phenomena in the Vadose Zone: A Review of Data and Numerical Modeling", p. 154-167.