1986. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Branch of Distribution. English. Public. Wyoming. Cretaceous.
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2. Geologic and biostratigraphic map of the Pierre Shale in the Colorado Springs-Pueblo area, Colorado
1986. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Branch of Distribution. English. Public. Colorado. Cretaceous.
1987. 2002-06-01T04:00:00Z. 2016-04-04T17:04:07Z. Geological Survey (U.S.). The Survey ; For sale by Branch of Distribution. English. Public. Mexico, Gulf of. Cretaceous.
1986. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Branch of Distribution. English. Public. Utah and Emery County. Cretaceous.