This volume contains fourteen papers on mathematical problems of flow and transport through porous media presented at the conference at Oberwolfach, June 21-27, 1992. Among the topics covered are miscible and immiscible displacement, groundwater contamination, reaction-diffusion instabilities and moving boundaries, random and fractal media, microstructure models, homogenization, spatial heterogeneities, inverse problems, degenerate equations. The papers deal with aspects of modeling, mathematical theory, numerical methods and applications in the engineering sciences.