Results of spirit leveling in Pennsylvania, 1899 to 1911, inclusive.
Marshall, R. B. 1867-1949.
Results of spirit leveling in Pennsylvania, 1899 to 1911, inclusive. R.B. Marshall, chief geographer. Work done in cooperation with the state. Reprinted with corrections. - Washington, Govt. Print. Off., 1918. - 164 p. pl. 24 cm. - Geological Survey bulletin, 515 .
gs 19000004
Pennsylvania--Altitudes.
QE75 / .B9 no. 515
Results of spirit leveling in Pennsylvania, 1899 to 1911, inclusive. R.B. Marshall, chief geographer. Work done in cooperation with the state. Reprinted with corrections. - Washington, Govt. Print. Off., 1918. - 164 p. pl. 24 cm. - Geological Survey bulletin, 515 .
gs 19000004
Pennsylvania--Altitudes.
QE75 / .B9 no. 515