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| View Original: | Survey towers GTS.jpg (1088x1580) | |||
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| Keywords: Survey towers GTS.jpg Survey towers used in the Great Trigonometrical Survey by George Everest cite journal Strahan C 1903 The Survey of India https //archive org/stream/professionalpape28grea page/n211/mode/2up Professional papers of the Corps of Royal Engineers 28 141-171 1903 C Strahan Great Trigonometrical Survey PD-old-70-1923 | ||||
