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Wood GH, Kehn TM, Devereux Carter, M and Culbertson WC (1983) Coal resource classification system of the U.S. Geological Survey. Geological Survey Circular 891, United States Geological Survey, Denver. Viewed 4 August 2014, http://www.pubs.usgs.gov/circ/c891/.
Last updated:
8 January 2018
Summary and download
Product Finalisation date
2015
PRODUCT CONTENTS
ASSESSMENT
ASSESSMENT COMPONENT