Electro-telegraphic longitude operations executed during the years 1885-86, 1887-88, 1889-90 and 1891-92 and the revised results of arcs contained in volumes IX and X : also the simultaneous reduction and the final results of the whole of the operations.
Survey of India.Trigonometrical Branch.
Dehra Dun : Office of the Trigonometrical Branch, Survey of India,
1893.
India. Great Trigonometrical Survey.
Longitude