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Publication Extents

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High-alumina kaolinitic clay in the United States, exclusive of Alaska and Hawaii
Helen R. Mark
1963, Mineral Investigations Resource Map 37
The general distribution of high-alumina kaolinitic clay deposits in the United States (exclusive of Alaska and Hawaii) is shown on the accompanying map. The locations of mines, pits, and prospects are shown by appropriate symbols. Certain clay-bearing areas are shown by patterns that designate the geologic age of the deposits....
Preliminary interpretation of an aeromagnetic survey in central and southwestern Iowa
John Richard Henderson, Isidore Zietz, Walter S. White
1963, Open-File Report 63-46
The U. S. Geological Survey made a 10,000 square mile aeromagnetic survey of central and southwestern Iowa in mid-1962. This work, done in cooperation with the Iowa Geological Survey, completed magnetic coverage for the approximately 220 mile section of the "midcontinent gravity high" located in Iowa....