TY  - BOOK
AU  - Marshall,R.B.
ED  - Pennsylvania.
TI  - Results of spirit leveling in Pennsylvania, 1899 to 1911, inclusive
T2  - Geological Survey bulletin,
AV  - QE75 .B9 no. 515
PY  - 1918///
CY  - Washington
PB  - Govt. Print. Off.
KW  - Pennsylvania
KW  - Altitudes
ER  -