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Elements of chart making (1916)
U.S. Coast and Geodetic Survey, Jones, Ernest Lester, 1876-1929 · Washington : Govt. Print. Off. · leaf 28
Special Publication No. 38. … Fig.2._A FIELD ASTRONOMIC STATION AT WHICH THE LATITUD OBSERVED. E IS BEING Special Publication No. 38.Charts, diagrams, etc
Internet Archive · University of Toronto, Robarts Library · Public Domain Mark 1.0. Free to use for anything.
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