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

by Spencer, Frank Darwyn, 1904-
Published 1986

Geology of the Tell City quadrangle, Kentucky-Indiana /

by Spencer, Frank Darwyn, 1904-
Published 1964

Geologic map of the Louisville quadrangle, Boulder County, Colorado /

by Spencer, Frank Darwyn, 1904-
Published 1961

Geology of the Pellville quadrangle, Kentucky /

by Spencer, Frank Darwyn, 1904-
Published 1963

Geology of parts of the Rockport and Lewisport quadrangles, Kentucky /

by Spencer, Frank Darwyn, 1904-
Published 1964

Geology of the Boltsfork quadrangle and part of the Burnaugh quadrangle, Kentucky /

by Spencer, Frank Darwyn, 1904-
Published 1964

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

by Spencer, Frank Darwyn, 1904-
Published 1986

Coal resources of Indiana /

by Spencer, Frank Darwyn, 1904-
Published 1953

Coal resources of Colorado /

by Spencer, Frank Darwyn, 1904-, Erwin, Margaret I.
Published 1953

Geophysical and lithologic logs of nine test holes drilled during 1980 in the Como West, Elmo, and T.E. Ranch quadrangles, Carbon County, Wyoming /

by Hansen, Dan E.
Published 1981

Geologic map of the Anawalt quadrangle, West Virginia-Virginia /

Published 1990