Catalog
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Clastic dikes intruding Cretaceous coals of western Colorado
Hardie, John K.Denver, Colo. : Colorado Geological Survey, 1999. -
Results of exploratory drilling for lignite in 1978, Fort Peck Indian Reservation, Roosevelt County, Montana [microform]
Hardie, John K.[Reston, Va.?] : The Survey, 1981. -
Dolomite and siliciclastic dikes and sills in marginal-marine Cretaceous coals of central Utah
Hardie, John K.Washington : U.S. G.P.O. ; Denver, CO : For sale by U.S. Geological Survey, Map Distribution, 1994.Online Full text via HathiTrust
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