1. IOR/F/4/1314/52440 Reference (shelfmark): IOR/F/4/1314/52440 Title: Scope & Content: Continuation of the Great Trigonometrical Survey towards Calcutta - measurement of a base line of verification near Barrackpore - construction of towers, etc. etc. Collection Area: India Office Records and Private Papers Languages: English Date Range: Nov 1830-Mar 1832 Extent: 1 file