1. IOR/R/20/A/1338 Reference (shelfmark): IOR/R/20/A/1338 Title: File 21/1 Aden Hinterland: Measures for safeguarding the Aden-Dthala caravan route and policing trade routes around Sheikh Othman Collection Area: India Office Records and Private Papers Languages: English Date Range: 1905-1911 Extent: 1 file