1. IOR/V/19/11 Reference (shelfmark): IOR/V/19/11 Title: Account of the Operations of the Great Trigonometrical Survey of India, Vol 10, Electro-telegraphic longtitude operations executed during the years 1881-82, 1882-83 and 1883-84 by Major G. Strahan and Major W.J. Heavisids. C.T. Haig. Dehra Dun, 1887 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1887 Extent: 1 volume