1. IOR/R/20/A/3834 Reference (shelfmark): IOR/R/20/A/3834 Title: File 1422 Naval defence of Aden: Enquiry by Naval Commander-in-Chief East Indies Station, for information in connection with the extension of dredged area in Aden Harbour Collection Area: India Office Records and Private Papers Languages: English Date Range: 1936 Extent: 1 file