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TYPE SECTIONS AND STRATIGRAPHY OF THE MEMBERS OF THE BLACKLEAF AND MARIAS RIVER FORMATIONS (CRETACEOUS) OF THE SWEETGRASS ARCH, MONTANA: PROFESSIONAL PAPER 974
Washington, DC: United States Geological Survey/USGS/Government Printing Office/GPO, 1976. Soft cover. Item #45619
A report of a formal subdivision and age assignments of a classic Cretaceous area. 66 pages with map, photographs, tables, sections, index and references. Bound in original gray stiff paper covers printed in black. Government stamp on the front cover. A very good plus copy.
Price: $20.00
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