TY  - BOOK
ED  - Geological Survey (U.S.)
ED  - United States.
TI  - Mineral resources of the Appalachian region,
T2  - Professional paper
AV  - QE75 .P9 no. 580
U1  - 553/.0974 
PY  - 1968///
CY  - Washington
PB  - U.S. Govt. Print. Off.
KW  - Mines and mineral resources
KW  - Appalachian Region
KW  - Geology
N1  - Part of illustrative matter fold. in pocket; Bibliography: p. 466-492
ER  -