Preliminary stratigraphic cross section (A1-A4) showing radioactive black shale zones and sandstones in the middle and upper Devonian, western Pennsylvania

অনুযায়ী Piotrowski, Robert G.
Reston, Virginia : Interior--Geological Survey, 1979

Preliminary stratigraphic cross section showing radioactive zones in the Devonian black shales in the southern part of the Appalachian Basin

অনুযায়ী Kepferle, Roy C., 1926-
Reston, Va. : U.S. Geological Survey, 1978

Preliminary stratigraphic cross section (A2-D2) showing radioactive black shale zones and sandstones in the middle and upper Devonian, western Pennsylvania

অনুযায়ী Piotrowski, Robert G.
Reston, Va. : Interior--Geological Survey, 1979

Preliminary stratigraphic cross section (D3-D4) showing radioactive black shale zones and sandstones in the middle and upper Devonian, western Pennsylvania

অনুযায়ী Piotrowski, Robert G.
Reston, Virginia : Interior--Geological Survey, 1979

Preliminary stratigraphic cross section (D1-D3) showing radioactive black shale zones and sandstones in the middle and upper Devonian, western Pennsylvania

অনুযায়ী Piotrowski, Robert G.
Reston, Virginia : Interior--Geological Survey, 1979

Preliminary stratigraphic cross sections showing radioactive zones in the Devonian black shales in the central part of the Appalachian Basin

অনুযায়ী Roen, John B.
Reston, Va. : U.S. Geological Survey, 1978

Preliminary stratigraphic cross section (B1-B4) showing radioactive black shale zones and sandstones in the middle and upper Devonian, western Pennsylvania

অনুযায়ী Piotrowski, Robert G.
Reston, Virginia : Interior--Geological Survey, 1979

Preliminary stratigraphic cross section (C4-D4) showing radioactive black shale zones and sandstones in the middle and upper Devonian, western Pennsylvania

অনুযায়ী Piotrowski, Robert G.
Reston, Va. : Interior--Geological Survey, 1979

Preliminary stratigraphic cross sections (A1-D1) showing radioactive black shale zones and sandstones in the middle and upper Devonian, western Pennsylvania

অনুযায়ী Piotrowski, Robert G.
Reston, Va. : Interior--Geological Survey, 1979

Preliminary stratigraphic cross section (A3-D3) showing radioactive black shale zones and sandstones in the middle and upper Devonian, western Pennsylvania

অনুযায়ী Piotrowski, Robert G.
Reston, Virginia : Interior--Geological Survey, 1979

Preliminary stratigraphic cross section showing radioactive zones in the Devonian black shales in the western part of the Appalachian Basin

অনুযায়ী Wallace, Laure G.
Reston, Va. : U.S. Geological Survey, 1977

Preliminary stratigraphic cross section (C1-C3) showing radioactive black shale zones and sandstones in the middle and upper Devonian, western Pennsylvania

অনুযায়ী Piotrowski, Robert G.
Reston, Virginia : Interior--Geological Survey, 1979