1. IOR/R/20/B/630 Reference (shelfmark): IOR/R/20/B/630 Title: File 57/4A Postal Matters: transmission of sealed mail bags containing despatches etc., from the Secretariat Aden, to the Secretary of State for the Colonies Collection Area: India Office Records and Private Papers Languages: English Date Range: 28 Apr 1937-20 Dec 1939 Extent: 1 file