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Frank Darwyn Spencer

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CoalCoal resources of the PhilippinesFrank Darwyn Spencer

Frank Darwyn Spencer · Philippine Bureau of Mines in cooperation with the United States Geological Survey under the auspices of the United States International Cooperation Administration and the Philippine Council for United States Aid

52 sayfa · 1957

Coal

Coal reservesCoal resources of ColoradoFrank Darwyn Spencer

Coal resources of Colorado

Frank Darwyn Spencer · U.S. Geological Survey

17 sayfa · 1953

Coal / Coal reserves

CoalCoal resources of IndianaFrank Darwyn Spencer

Coal resources of Indiana

Frank Darwyn Spencer · Yayınevi bilinmiyor

42 sayfa · 1953

Coal

Natural gasCoal geology and coal, oil, and gas resources of the Erie and Frederick Quadrangles, Boulder and Weld Counties, ColoradoFrank Darwyn Spencer

Coal geology and coal, oil, and gas resources of the Erie and Frederick Quadrangles, Boulder and Weld Counties, Colorado

Frank Darwyn Spencer · U.S. G.P.O.

50 sayfa · 1986

Coal / Petroleum / Natural gas