21. IOR/R/20/G/202 Reference (shelfmark): IOR/R/20/G/202 Title: Aden defence scheme London: Oversea Defence Committee [1937] Secret Collection Area: India Office Records and Private Papers Languages: English Date Range: 1937 Extent: 1 volume
22. IOR/R/20/G/203 Reference (shelfmark): IOR/R/20/G/203 Title: Review of events in the Colony and Protectorate of Aden and operations, 1 May 1954 to date Aden: HQ British Forces, 13 Aug 1955 typ Secret Collection Area: India Office Records and Private Papers Languages: English Date Range: 1955 Extent: 1 volume
23. IOR/R/20/G/204 Reference (shelfmark): IOR/R/20/G/204 Title: Operations in Radfan, 14 Apr 1930-30 Jun 1964 Aden: Headquarters Middle East Land Forces, 1964 Confidential Collection Area: India Office Records and Private Papers Languages: English Date Range: 1964 Extent: 1 volume
24. IOR/R/20/G/205 Reference (shelfmark): IOR/R/20/G/205 Title: British Intelligence survey. Aden and the Protectorate of South Arabia Pt V: Transportation London: Defence Intelligence Staff, Ministry of Defence, Jan 1965 Confidential Collection Area: India Office Records and Private Papers Languages: English Date Range: 1965 Extent: 1 volume