01204cam a22003011i 4500 gs 10000499 DLC 20260227111310.0 790508s1910 dcu f001 0 eng gs 10000499 (OCoLC)4940821 DLC ICharE DLC premarc n-us-de n-us-dc n-us-md n-us-va QE75 .B9 no. 434 Marshall, R. B. (Robert Bradford), 1867-1949. Results of spirit leveling in Delaware, District of Columbia, Maryland, and Virginia, 1896 to 1909, inclusive. R.B. Marshall, Chief geographer. Work done in cooperation with the state of Maryland during the entire period and with the state of Virginia in part of 1908. Washington, Govt. Print. Off., 1910. 74 p. 24 cm. U.S. Geological survey. Bulletin no. 434 Issued also as House doc. no. 1015, 61st Cong., 3d sess. Includes index. Delaware Altitudes. Washington (D.C.) Altitudes. Maryland Altitudes. Virginia Altitudes. United States. Geological Survey. Bulletin ; 434. 24950 24950