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1
Preliminary stratigraphic cross section (A1-A4) showing radioactive black shale zones and sandstones in the middle and upper Devonian, western Pennsylvania
di Piotrowski, Robert G.
Reston, Virginia : Interior--Geological Survey, 1979

Libro
3
Preliminary stratigraphic cross section (D3-D4) showing radioactive black shale zones and sandstones in the middle and upper Devonian, western Pennsylvania
di Piotrowski, Robert G.
Reston, Virginia : Interior--Geological Survey, 1979

Libro
4
Preliminary stratigraphic cross section (D1-D3) showing radioactive black shale zones and sandstones in the middle and upper Devonian, western Pennsylvania
di Piotrowski, Robert G.
Reston, Virginia : Interior--Geological Survey, 1979

Libro
5
Preliminary stratigraphic cross section (B1-B4) showing radioactive black shale zones and sandstones in the middle and upper Devonian, western Pennsylvania
di Piotrowski, Robert G.
Reston, Virginia : Interior--Geological Survey, 1979

Libro
8
Preliminary stratigraphic cross section (A3-D3) showing radioactive black shale zones and sandstones in the middle and upper Devonian, western Pennsylvania
di Piotrowski, Robert G.
Reston, Virginia : Interior--Geological Survey, 1979

Libro
9
Preliminary stratigraphic cross section (C1-C3) showing radioactive black shale zones and sandstones in the middle and upper Devonian, western Pennsylvania
di Piotrowski, Robert G.
Reston, Virginia : Interior--Geological Survey, 1979

Libro
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