TY  - BOOK
AU  - Darton,Nelson Horatio
TI  - Configuration of the bedrock surface of the District of Columbia and vicinity
AV  - QE75 .P9 no. 217
U1  - 552 
PY  - 1950///
CY  - Washington
PB  - U.S. Govt. Print. Off.
KW  - Petrology
KW  - Washington (D.C.)
KW  - Physical geography
KW  - Borings
ER  -