Tables showing difference of level in feet : corresponding to a given angle when the distance is read in metres or feet, and for horizontal reductions, for use with stadia / Computed by J.A. Ockerson and Jared Teeple ...
|Main Author:||Ockerson, John Augustus, 1849-|
|Other Authors:||Teeple, Jared.|
Washington, D.C. : G.P.O., 1879.
At head of title: Engineer Department, U.S.A.
65 p. ;
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