Author: KNECHTEL, M.M. & S.H. PATTERSON
Title: Bentonite deposits of the northern Black Hills District, Wyoming, Montana, and South Dakota.
Description: 1962. United States Geological Survey Bulletin 1082-M; pp. 893-1030, 19 fig. 4 photoplts. h.t. 2 fold. tables and fold. & tinted geol map in 2 sheets in pocket. Orig. wrps.

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