The principal triangulation of the South-East quadrilateral, including the great arc, section 18°- 24°, the East Coast series, the Calcutta and the Bider longitudinal series, the Jabalpur and the Bilaspur meridional series, and the details of their simultaneous reduction.
India.Great Trigonometrical Survey.
Dehra Dun : Office of the Great Trigonometrical Survey,
1880.
India. Great Trigonometrical Survey.
Geodesy
Triangulation