1. IOR/L/E/7/913 File 2720 Reference (shelfmark): IOR/L/E/7/913 File 2720 Title: American duty on Natural Indigo Scope & Content: Papers regarding American proposal to increase present duty on indigo from 30 percent to 40 percent. Collection Area: India Office Records and Private Papers Languages: English Date Range: 13 Jul 1917-15 Dec 1917 Extent: 1 file