Geology and mineral resources of the Carlisle and Mechanicsburg quadrangles, Cumberland County, Pennsylvania /

by Root, Samuel I.
Harrisburg : Commonwealth of Pennsylvania, Department of Environmental Resources, Bureau of Topographic and Geologic Survey, 1978

Geology and mineral resources of the Harrisburg west area, Cumberland and York counties, Pennsylvania /by Samuel I. Root.

by Root, Samuel I.
Harrisburg : Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey, 1977

Geology and mineral resources of the Harrisburg west area, Cumberland and York Counties, Pennsylvania /

by Root, Samuel I.
Harrisburg, Pa. : Pennsylvania Bureau of Topographic and Geologic Survey, 1977

Geology and mineral resources of northeastern Franklin County, Pennsylvania.

by Root, Samuel I.
Harrisburg [Dept. of Environmental Resources, Topographic and Geologic Survey], 1971

Geology and mineral resources of the Harrisburg west area, Cumberland and York Counties, Pennsylvania.

by Root, Samuel I.
Harrisburg [Pennsylvania Topographic and Geologic Survey], 1977

Geology of Knox County /

by Root, Samuel I.
Columbus, [Ohio] : Division of Geological Survey, 1961

Geology and mineral resources of northeastern Franklin County, Pennsylvania,

by Root, Samuel I.
Harrisburg [Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey] 1971

Geology and mineral resources of southeastern Franklin County, Pennsylvania /

by Root, Samuel I.
Harrisburg : [Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey], 1968

Geology and mineral resources of the Carlisle and Mechanicsburg quadrangles, Cumberland County, Pennsylvania /

by Root, Samuel I.
[Harrisburg, Pa.] : Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey, 1978

Geology of Knox County /

by Root, Samuel I.
Columbus [Ohio] : Division of Geological Survey, 1961

Geology and mineral resources of northeastern Franklin County, Pennsylvania /

by Root, Samuel I.
Harrisburg, Pa. : Pennsylvania Bureau of Topographic and Geologic Survey, 1971

Geology and mineral resources of the Carlisle and Mechanicsburg quadrangles, Cumberland county, Pennsylvania /

by Root, Samuel I.
[Harrisburg, Pa.] : Pennsylvania Bureau of Topographic and Geologic Survey, 1978

Geology and mineral resources of the Harrisburg west area, Cumberland and York Counties, Pennsylvania /

by Root, Samuel I.
Harrisburg, Pa. : Pennsylvania Bureau of Topographic and Geologic Survey, 1977

Geology and mineral resources of southeastern Franklin County, Pennsylvania /

by Root, Samuel I.
Harrisburg, Pa. : Pennsylvania Bureau of Topographic and Geologic Survey, 1968

Geology and mineral resources of the Harrisburg west area, Cumberland and York Counties, Pennsylvania /by Samuel I. Root.

by Root, Samuel I.
Harrisburg : Pennsylvania Geological Survey, 1977

Geology and mineral resources of northeastern Franklin County, Pennsylvania /

by Root, Samuel I.
Harrisburg : [Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey], 1971

Summary of isotopic age determinations in Pennsylvania /

by Lapham, Davis M., Root, Samuel I.
Harrisburg [Pa.] : Pennsylvania Bureau of Topographic and Geologic Survey, 1971

Geologic conditions affecting safe bituminous coal mining in Pennsylvania : selected papers /

Harrisburg, Pa. : Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey, 1979

Summary of isotopic age determinations in Pennsylvania,

by Lapham, Davis M.
Harrisburg, Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey, 1971

Comparative tectonics and stratigraphy of the Cumberland and Lebanon valleys,

by MacLachlan, David B.
Harrisburg, Pa., Bureau of Topographic and Geologic Survey, Dept. of Internal Affairs, 1966