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Niobium and tantalum in the United States, exclusive of Alaska and Hawaii
Raymond Laurence Parker
1963, Mineral Investigations Resource Map 36
The accompanying map shows the location of the principal known deposits of niobium and tantalum minerals in the United States, exclusive of Alaska and Hawaii. Symbols of different shapes are used to depict deposits of different geologic types, and large symbols denote deposits with a record of production. Small symbols...
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....