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Index Chart to the Great Trigonometrical Survey of India. Sh. Image taken from Index Chart to the Great Trigonometrical Survey of India, showing net work of Triangulation Completed to 1st May, 1870 (--1st October, 1895). Scale, 96 miles = 1 inch. Originally published in Calcutta : Surveyor General's Office, 1870-1895.
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