The principal triangulation : the base-line figures, the Karachi longitudinal, N.W. Himalaya, and Great Indus series of the North-West Quadrilateral /
Walker, James Thomas,1826-1896.
India.Great Trigonometrical Survey.
Dehra Dun : Office of the Great Trigonometrical Survey,
1873
"Issued in 1879."
India. Great Trigonometrical Survey.
Geodesy
Geodesy
Triangulation
Triangulation