Publisher: Geological Survey / Year: 1940 - Yale University Library GeoBlacklight Search Results

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1. Part of Niagara Peninsula, Ontario, showing structure contours drawn on top of the Clinton formation and positions of wells drilled to obtain natural gas [cartographic material]

1940. 2012-06-07T18:06:49Z. 2012-06-13T15:05:19Z. Canada. Bureau of Geology and Topography. Geological Survey. English. Public. Ontario and Niagara Peninsula.

2. [United States major cities and vicinities maps].

1940. 2018-03-27T20:05:24Z. 2020-08-14T18:08:39Z. Geological Survey (U.S.). Geological Survey. English. cartographic image. Public. United States.

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