1. IOR/V/19/1 Reference (shelfmark): IOR/V/19/1 Title: Account of the Operations of the Great Trigonometrical Survey of India, Vol 1, The standards of measure and the base-lines; also an introductory account of the early operations of the Survey during the period 1800-1830. J.T. Walker. Dehra Doon, 1870 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1870 Extent: 1 volume