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   ocr: ZUSGS science fora a changing world National Coal Resource Assessment 1999 Resource Assessmient of Selected Tertiary Coal BetsandIsnes in the Northern Rocky Mountains and Great Plains Region Byl Fort Union Coal Assessment Team Professional Paper 1625-A Discs 1 and 2 Version 1.2 1999 U.S.Department of the Interior Rocky Mountains U.S. Geological Survey and Great Plains