Bentonite deposits in marine Cretaceous formations, Hardin district, Montana and Wyoming /
Knechtel, Maxwell M.(Maxwell McMichael), 1897-
Patterson, Sam H.(Sam Hunting),1918-
Washington, [D.C.] : U.S. G.P.O.,
1956.
Two folded leaves in pocket.
Includes index.
Bibliography: p. 113-114.
Bentonite.