1. IOR/Z/E/4/19/M1640 Reference (shelfmark): IOR/Z/E/4/19/M1640 Title: Mints, Calcutta, Dr. O'Shaughnessy's process a for refinage and extraction of gold from silver not to be divulged Collection Area: India Office Records and Private Papers Languages: English Date Range: 1846-1849 Extent: 1 entry