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The methods used in primary level and triangulation work in unsettled and broken country (1909)
Stewart, John Truesdale · leaf 309
X MAP SHOWING ROADS AND TRAILS TRAVELED IN THEGRAND CRN YON TRIANGULA TJON. … Tfoac/ frave/ec/ i>y vra^on.- Tra// trave/ed 6y Pacirfram/ in. « JS mi.Geodesy · Surveying · Triangulation · Theses
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
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