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Results of triangulation and primary traverse, 1911 and 1912

Marshall, R. B. (Robert Bradford), 1867-1949, author.
[Washington, D.C.] : U.S. Department of the Interior, U.S. Geological Survey, 1914. 1914

Results of triangulation and primary traverse for the years 1906, 1907, and 1908

Marshall, R. B. (Robert Bradford), 1867-1949, author.
Washington, D.C. : Department of the Interior, United States Geological Survey, 1910. 1910

Results of triangulation and primary traverse for the years 1909 and 1910

Marshall, R. B. (Robert Bradford), 1867-1949, author.
Washington, D.C. : Department of the Interior, United States Geological Survey, 1912. 1912

Spirit leveling in Arkansas, 1896 to 1915, inclusive

Marshall, R. B. (Robert Bradford), 1867-1949, author.
[Washington, D.C.] : Department of the Interior, United States Geological Survey, 1916. 1916

Spirit leveling in Georgia, 1896 to 1914, inclusive

Marshall, R. B. (Robert Bradford), 1867-1949, author.
[Washington, D.C.] : Department of the Interior, United States Geological Survey, 1916. 1916

Spirit leveling in Illinois, 1914 to 1917, inclusive

Marshall, R. B. (Robert Bradford), 1867-1949, author.
[Washington, D.C.] : Department of the Interior, United States Geological Survey, 1918. 1918

Spirit leveling in Kentucky, 1914 to 1916, inclusive

Marshall, R. B. (Robert Bradford), 1867-1949, author.
[Washington, D.C.] : Department of the Interior, United States Geological Survey, 1918. 1918

Spirit leveling in Louisiana, 1903 to 1915, inclusive

Marshall, R. B. (Robert Bradford), 1867-1949, author.
[Washington, D.C.] : Department of the Interior, United States Geological Survey, 1916. 1916

Spirit leveling in Maine, 1899-1915

Marshall, R. B. (Robert Bradford), 1867-1949, author.
[Washington, D.C.] : Department of the Interior, United States Geological Survey, 1916. 1916

Spirit leveling in Mississippi, 1901 to 1915, inclusive

Marshall, R. B. (Robert Bradford), 1867-1949, author.
[Washington, D.C.] : Department of the Interior, United States Geological Survey, 1916. 1916

Spirit leveling in Nevada, 1897 to 1916, inclusive

Marshall, R. B. (Robert Bradford), 1867-1949, author.
[Washington, D.C.] : Department of the Interior, United States Geological Survey, 1917. 1917

Spirit leveling in New Mexico, 1902 to 1915, inclusive

Marshall, R. B. (Robert Bradford), 1867-1949, author.
[Washington, D.C.] : Department of the Interior, United States Geological Survey, 1916. 1916

Spirit leveling in New York, 1896-1905 and 1912-1916

Marshall, R. B. (Robert Bradford), 1867-1949, author.
[Washington, D.C.] : Department of the Interior, United States Geological Survey, 1918. 1918

Spirit leveling in North Carolina, 1896 to 1914, inclusive

Marshall, R. B. (Robert Bradford), 1867-1949, author.
[Washington, D.C.] : Department of the Interior, United States Geological Survey, 1916. 1916

Spirit leveling in Ohio, 1898 to 1916, inclusive

Marshall, R. B. (Robert Bradford), 1867-1949, author.
[Washington, D.C.] : Department of the Interior, United States Geological Survey, 1917. 1917

Spirit leveling in South Dakota, 1896 to 1915, inclusive

Marshall, R. B. (Robert Bradford), 1867-1949, author.
[Washington, D.C.] : Department of the Interior, United States Geological Survey, 1916. 1916

Spirit leveling in Texas, 1896 to 1915, inclusive

Marshall, R. B. (Robert Bradford), 1867-1949, author.
[Washington, D.C.] : Department of the Interior, United States Geological Survey, 1916. 1916

Spirit leveling in the State of Washington, 1896 to 1917, inclusive

Marshall, R. B. (Robert Bradford), 1867-1949, author.
[Washington, D.C.] : Department of the Interior, United States Geological Survey, 1918. 1918

Spirit leveling in West Virginia, 1896 to 1915, inclusive

Marshall, R. B. (Robert Bradford), 1867-1949, author.
[Washington, D.C.] : Department of the Interior, United States Geological Survey, 1916. 1916