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Bituminous coal deposits of the Matanuska coalfield, Alaska: Central and western parts, Wishbone district (Report of investigations / United States De - Robert S Warfield
Summary of coal drilling results: Beluga River coal field, 1959 ([Miscellaneous reports) - Robert S Warfield
Rotary drilling for strippable coal in the Jarvis Creek coalfield, Alaska (Open-file report) - Robert S Warfield
Examination of coal deposits: Sitkinak Island, Alaska (U.S.G.S. open-file report) - Robert S Warfield
Resume of information on Alaskan bituminous coals with particular emphasis on coking characteristics (Open file report) - Robert S Warfield
Sampling and coking studies of several coalbeds in the Kokolik River, Kukpowruk River, and Cape Beaufort areas of arctic northwestern Alaska (Report o - Robert S Warfield
Sampling and coking studies of coal from Castle Mountain Mine, Matanuska coalfield, Alaska (Open-file report) - Robert S Warfield
Investigation of a subbituminous coal deposit suitable for opencut mining, Beluga River Coalfield, Alaska (Report of investigations) - Robert S Warfield
Sampling and coking studies of coal from the Kukpowruk River area, Arctic northwestern Alaska (Report of investigations) - Robert S Warfield