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1
1999 resource assessment of selected Tertiary coal beds and zones in the northern Rocky Mountains and Great Plains region
Denver, CO : U.S. Dept. of the Interior, U.S. Geological Survey ; USGS Information Services [distributor], 1999
Version 1.1.

Government Document Electronic Book
2
1999 resource assessment of selected tertiary coal beds and zones in the northern Rocky Mountains and Great Plains region
Denver, CO : U.S. Dept. of the Interior, U.S. Geological Survey : USGS Information Services [distributor], 1999
Version 1.1.

Government Document Electronic Book
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