00953cam a22002771 4500 gs 12000790 DLC 20260227111313.0 790822s1912 dcu f001 0 eng gs 12000790 (OCoLC)5297763 DLC ICharE DLC premarc n-us-pa w9x1 QE75 .B9 no. 515 Marshall, R. B. (Robert Bradford), 1867-1949 Results of spirit leveling in Pennsylvania, 1899 to 1911, inclusive. R. B. Marshall, chief geographer. Work done in cooperation with the state. Washington, Govt. Print. Off., 1912. 164 p. 24 cm. U.S. Geological survey. Bulletin 515 Includes index. Pennsylvania Altitudes. Pennsylvania. Bureau of Topographic and Geologic Survey United States. Geological Survey. Bulletin ; 515. 25197 25197