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Books by Frank Darwyn Spencer
4 titles
Coal geology and coal, oil, and gas resources of the Erie and Frederick Quadrangles, Boulder and Weld Counties, Colorado
Coal geology and coal, oil, and gas resources of the Erie and Frederick Quadrangles, Boulder and Weld Counties, Colorado
Frank Darwyn Spencer
1986
Coal resources of Indiana
Coal resources of Indiana
Frank Darwyn Spencer
1953
Coal resources of the Philippines
Coal resources of the Philippines
Frank Darwyn Spencer
1957
Coal resources of Colorado
Coal resources of Colorado
Frank Darwyn Spencer
1953