2 GEOLOGICAL SURVEY CIRCULARS


Stratigraphic Sections of the Phosphoria Formation in Montana,

1947-48

1949-51


These Geological Survey Circulars were published by the U.S. Department of the Interior.  Each is an 8 x 10.5 inch staple-bound softcover book.  Each book is in good condition with no tears or holes.  The first was printed in 1952, the second was printed in 1953.


Authors of each survey are as follows:

1947-48; Circular 211:  L. E. Smith, G. F. Hosford, R. S. Sears, D. P. Sprouse, and M. D. Stewart

1949-51; Circular 306:  T. M. Cheney, R. A. Smart, R. G. Waring, and M. A. Warner


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