TY  - BOOK
AU  - Clapp,Frederick G.
TI  - Economic geology of the Amity quadrangle, eastern Washington County, Pennsylvania
T2  - U.S. Geological survey. Buletin
AV  - QE75 .B9 no. 300
PY  - 1907///
CY  - Washington
PB  - Govt. Print. Off.
KW  - Mines and mineral resources
KW  - Pennsylvania
KW  - Washington County
KW  - Geology
N1  - Subject series: A, Economic geology, 86; B, Descriptive geology, 105; Issued also as House doc. no. 53, 59th Cong., 2d sess; Includes index; Bibliography: p. 140
ER  -