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Cover: Well-developed columnar joints in dense flow interiors near White Rock. This image is from D.E. Broxton and D.T. Vaniman, "Geologic Framework of a Groundwater System on the Margin of a Rift Basin, Pajarito Plateau, North-Central New Mexico," p. 522-550 , one of the articles in this issue's special section on Los Alamos National Laboratory.