1. Precambrian basement structure map of the continental United States, an interpretation of geologic and aeromagnetic data Author/Creator: Sims, P. K. 1918-2011. (Paul Kibler) Publication/Creation: [Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey ; Denver, CO : Information Services [distributor], 2008 Resource Type: Map Access & Availability: Loading