Electro-telegraphic longitude operations executed during the years 1894-95-96 : the Indo-European arcs from Karachi to Greenwich.
Heaviside, William James,1840-
Survey of India.Trigonometrical Branch.
Dehra Dun : Office of the Trigonometrical Branch, Survey of India,
1901 .
India. Great Trigonometrical Survey.
Longitude