1. IOR/Z/E/4/18/S1437 Reference (shelfmark): IOR/Z/E/4/18/S1437 Title: Surveys, Instruments, Measurement of Great Arc of the Meridian for deposited in Agra Fort, measures adopted for preservation of Collection Area: India Office Records and Private Papers Languages: English Date Range: 1844-1846 Extent: 1 entry