A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 355
the benches of the survey should be determined from these points,in order that all points may be given in true elevation. In assuming a datum, the aneroid may be used in estimating the CONTOURS. 345 elevation of the bench from which to start; or, if there is no objectin having elevations referred…
Surveying
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