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1885. 2012-03-14T13:56:57Z. 2012-07-05T13:00:13Z. Geological Survey of Pennsylvania. Second Geological Survey of Pennsylvania. English. Public. Pennsylvania, Ironton, Lehigh County, Northampton County, Northampton County (Pa.), Lehigh County (Pa.), Bucks County (Pa.), Berks County (Pa.), South Mountain Region (Lehigh County, Pa.), and Ironton (Pa.).

3. Iron in Canada : metallogenic map

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1959. 2018-02-02T21:23:30Z. 2021-02-15T20:41:50Z. Geological Survey of Canada. Geological Survey, Surveys and Mapping Branch). English. cartographic image. Public. Canada and Canada.