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6. Bedrock topography of northwest Iowa

Yale Public content
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. Iowa.
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. Iowa.

8. Burgeo, Newfoundland

Yale Public content
1986. 2018-05-02T17:38:54Z. 2020-08-14T18:08:34Z. O'Brien, S. J., cartographer. Mineral Development Division. English. cartographic image. Public. Newfoundland and Labrador and Burgeo area.

10. Depth to bedrock in North Dakota

Yale Public content
1986. 2008-09-04T13:13:08Z. 2011-03-25T21:38:24Z. Bluemle, John P. North Dakota Geological Survey. English. Public. North Dakota.