You searched for: Subject Coal Remove constraint Subject: Coal Subject Coalfields Remove constraint Subject: Coalfields Place Massachusetts Remove constraint Place: Massachusetts Data type Polygon Remove constraint Data type: Polygon Year 2001 Remove constraint Year: 2001
2001. Eastern Energy Resource Surveys Team (Geological Survey). This polygon shapefile shows the coal fields of Alaska and the conterminous United States. Most of the material for the conterminous United States ... National Atlas of the United States.