Results of spirit leveling in Delaware, District of Columbia, Maryland, and Virginia, 1896 to 1909, inclusive. - Marshall, R. B. (Robert Bradford), 1867-1949. (Washington, Govt. Print. Off., 1910)
Issued also as House doc. no. 1015, 61st Cong., 3d sess.
Includes index.
Keywords: Delaware -- Altitudes; Washington (D.C.) -- Altitudes; Maryland -- Altitudes; Virginia -- Altitudes