1. Precambrian basement structure map of the continental United States, an interpretation of geologic and aeromagnetic data Yale Public content 2008. 2008-09-30T14:29:58Z. 2020-10-16T19:18:39Z. Sims, P. K. (Paul Kibler), 1918-2011. U.S. Dept. of the Interior, U.S. Geological Survey ; Information Services [distributor]. English. Public. United States. Precambrian.