Strange, W. E. (1982). Scribing, graduation, and calibration of U.S. Coast and Geodetic Survey leveling rods from 1877 to 1968. Rockville, Md.: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Ocean Survey.
Παραπομπή Chicago StyleStrange, William E. Scribing, Graduation, and Calibration of U.S. Coast and Geodetic Survey Leveling Rods From 1877 to 1968. Rockville, Md.: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Ocean Survey, 1982.
Παραπομπή MLAStrange, William E. Scribing, Graduation, and Calibration of U.S. Coast and Geodetic Survey Leveling Rods From 1877 to 1968. Rockville, Md.: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Ocean Survey, 1982.