21. '1/C Volume IV Miscellaneous' Contributor: Mutasarrif of Basra Liwa (correspondent)Director-General of Posts and Telegraphs (correspondent)RAF, Iraq Command (correspondent)Government of India, Army Headquarters (correspondent)General Administration of Customs (correspondent)District Magistrate, Bahrain (correspondent) Date: 1923/1924 Language: EnglishArabic Geographic region: Hijaz Extent: 1 volume (312 folios)
22. 'L'Arabie contemporaine avec la description du pèlerinage de la Mecque et une nouvelled carte géographique de Kiepert.' Contributor: E Maillet (publisher)Louis Marie Adolphe d'Avril (author)Heinrich Kiepert (cartographer)Jean Baptiste Marie Augustin Challamel (publisher) Date: 1868/1868 Language: EnglishFrench Extent: 1 volume (313 pages)
23. '(F 69) File 82/26 A.P.O.C. - Muscat Oil Concession' Contributor: Political Agent and Consul, Muscat (correspondent)D'Arcy Exploration Company Limited (correspondent) Date: 1925/1928 Language: English Extent: 1 file (77 folios)
24. '(Manuscript of Notes to accompany Map of Persia (published by R.G.S) and the introduction to Haji Baba written by G.N.C. for Macmillan in 1895)' Contributor: George Augustin Macmillan (correspondent) Date: 1895/1895 Language: English Geographic region: BaluchistanAfghanistan Extent: 1 file (70 folios)
25. 'File 19/248 I (C 78) Education at Bahrain' Contributor: James Orton (correspondent)Francis Warden (correspondent)Hugh Weightman (correspondent) Date: 1939/1940 Language: English Geographic region: BahrainBūshehr Extent: 1 volume (245 folios)
26. '3/3 Political Officer, Trucial Coast' Date: 1939/1950 Language: English Extent: 1 file (156 folios)
27. '3/12 Officials of the Public Works Department' Date: 1935/1942 Language: English Extent: 1 file (25 folios)
28. '7/2 General Correspondence on Military Matters' Date: 1921/1930 Language: English Extent: 1 file (112 folios)
29. '11/1 TREATMENT OF BAHARNA IN HASA AND QATIF' Contributor: Political Resident, Persian Gulf (correspondent)British Legation to Saudi Arabia (correspondent) Date: 1914/1950 Language: English Geographic region: HasaQatif Extent: 1 file (5 folios)
30. '11/2 PROPOSED EXTRADITION TREATY BETWEEN BAHRAIN, NEJD, & KUWAIT - SAUDI AGREEMENT' Contributor: Political Resident, Persian Gulf (correspondent)Adviser to the Government of Bahrain (correspondent) Date: 1932/1933 Language: EnglishArabic Extent: 1 file (51 folios)