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	1.	Image from Google Jackets	Account of the operations of the Great Trigonometric Survey of India. Volume XII General description of the principal triangulation of the Southern Trigon including the simultaneous reduction, and details of two of the component series the Great Arc Meridional, Sec. 8 to 18, and the Bombey Longitudinal. by Strahan, G Survey of India Language: English Publication details: Dehra Dun Survey of India 1890 Availability: Items available for loan: London (1)Collection, call number: SHELF 199.
	2.	Image from Google Jackets	Account of the operations of the Great Trigonometric Survey of India. Volume II History and general description of the principal triangulation and of its reduction. by Walker, J.T Survey of India Language: English Publication details: Dehra Dun Survey of India 1879 Availability: Items available for loan: London (2)Collection, call number: SHELF 199, ...

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