Hosterman, John W., and Sam H. Patterson

Bentonite and fuller's earth resources of the United States; U. S. Geological Survey Professional Paper 1522

Washington: United States Government Printing Office, 1992. softcover, 11" 8.5", 45 pages, plate 1 folded inside rear pocket. very good. Item #5570323

from the abstract, "The term bentonite is defined as any natural material composed dominantly of the clay mnerals of the smectitie group and whose properties are controlled by these clay minerals."

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