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1
Middle Devonian stratigraphy in central Pennsylvania : a revision /
by Faill, Rodger T.
Harrisburg : Pennsylvania Geological Survey, 1978
“...General geology report ;...”

Manuscript Book
2
Fossil collecting in Pennsylvania /
by Hoskins, Donald M.
Harrisburg : [Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey], 1969
2nd printing, rev. 1969.
“...General geology report ;...”

Manuscript Book
3
Geology of the Appalachian Trail in Pennsylvania /
by Wilshusen, John P.
Harrisburg : Pennsylvania Geological Survey, 1983
“...General geology report ;...”

Manuscript Book
4
Annotated bibliography of Pennsylvania geology : supplement to 1979 /
Harrisburg : The Survey, 1986
“...General geology report ;...”

Manuscript Book
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