U.S. Coast and Geodetic Survey, Jones, Ernest Lester, 1876-1929 · Washington : Govt. Print. Off. · leaf 48
Fig. 11.—OBSERVER AT WORK ON THE COAST TRIANGU LATION, MEASURING ANGLESFOR THE DETERMINATION OF THE POSITIONS OF OBJECTS USED TO CONTROLTHE TOPOGRAPHIC AND HYDROGRAPHIC SURVEYS. Special Publication No. 38. … J UJ Special Publication fJo. 38.
Charts, diagrams, etc
Internet Archive · University of Toronto, Robarts Library · Public Domain Mark 1.0. Free to use for anything.
