Bench-marks

Tidal datum planes

by H. A. Marmer, assistant chief, Division of tides and currents, U. S. Coast and geodetic survey ...

Spirit leveling in Illinois, 1896-1941.

prepared in cooperation with the State of Illinois, Department of Registration and Education, Geological Survey Division.

Spirit leveling in West Virginia, 1896 to 1915, inclusive

R. B. Marshall, chief geographer ; work done in cooperation with the West Virginia State Geological Survey during 1898 to 1915, inclusive.

Tidal bench marks: state of Rhode Island

by L.A. Cole, associate mathematician, U.S. Coast and Geodetic Survey.

Tidal bench marks, San Francisco Bay region: T-21 (revised)

U.S. Coast and Geodetic Survey

Spirit leveling in North Carolina, 1896 to 1914, inclusive

R. B. Marshall, chief geographer ; work done in cooperation with the State of North Carolina in 1896 and from 1902 to 1910, inclusive.

Spirit leveling in Arkansas, 1896 to 1915, inclusive

R. B. Marshall, chief geographer.

Spirit leveling in Mississippi, 1901 to 1915, inclusive

R. B. Marshall, chief geographer ; part of work since 1906 done in cooperation with State of Mississippi through Tallahatchie Drainage Commission.

Tidal bench marks, state of Oregon

by L. A. Cole.

Spirit leveling in Maine, 1899-1915

R. B. Marshall, chief geographer ; work done in cooperation with the State.