1. IOR/Z/E/4/19/O270 Reference (shelfmark): IOR/Z/E/4/19/O270 Title: O'Shaughnessy, William Brookes, M.D., (Deputy Assay Master), Expediency of substituting electric telegraph for semaphore between Calcutta & Diamond Harbour reference to Collection Area: India Office Records and Private Papers Languages: English Date Range: 1846-1849 Extent: 1 entry