TY  - BOOK
AU  - Willard,Bradford
AU  - Swartz,Frank M.
AU  - Cleaves,Arthur B.
ED  - Pennsylvania.
TI  - The Devonian of Pennsylvania: Middle and upper Devonian 
AV  - QE665 .P42 1939
PY  - 1939///
CY  - Harrisburg, Pa.
PB  - Dept. of internatl affairs, Topographic and geologic survey
KW  - Geology, Stratigraphic
KW  - Devonian
KW  - Geology
KW  - Pennsylvania
KW  - Paleontology
N1  - At head of title: Pennsylvania Geological Survey, Fourth series; Bibliography: p. 434-445
ER  -