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1
The Devonian of Pennsylvania : Middle and upper Devonian /
Harrisburg, Pa. : Dept. of internatl affairs, Topographic and geologic survey, 1939
“...Bulletin G ;...”

Book
2
Guidebook to the geology of the Pennsylvania turnpike /
by Cleaves, Arthur B. (Arthur Bailey), 1905-
Harrisburg, Pa. : Topographic and Geologic Survey, 1942
“...Pennsylvania Geologic survey. Bulletin G 20....”

Book
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