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1
Mineral collecting in Pennsylvania /
by Lapham, Davis M.
Harrisburg : [Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey], 1969
3d ed.
“...Bulletin G (Pennsylvania. Bureau of Topographic and Geologic Survey) ;...”

Map
2
Stratigraphic correlation chart of Pennsylvania /
[Harrisburg] : Commonwealth of Pennsylvania, Dept. of Environmental Resources, Topographic and Geologic Survey, 1986
2nd. printing, revised
“...Bulletin G (Pennsylvania. Bureau of Topographic and Geologic Survey);...”

Map
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