49. ‘Vol 21 Letters inward’ Contributor: Residency Surgeon, Persian Gulf (correspondent) Date: 1819/1820 Language: English Geographic region: Rass el Khyma Extent: 1 volume, 95 items (62 folios)
50. 'Vol 212 Secret Correspondence: Bahrain; Muscat and Bandar Abbas; Miscellaneous and Local' Contributor: HM Ambassador to Iran (correspondent)Political Agent, Turkish Arabia (correspondent)Āl 'Alī (Family) (correspondent) Date: 1856/1857 Language: EnglishArabic Geographic region: Bunder AbbasMuscat Extent: 2 volumes (305 folios)
51. ‘Vol 239 Miscellaneous general and secret correspondence’ Contributor: Sultan of Muscat and Oman, Āl Bū Sa'īd Dynasty (correspondent) Date: 1857/1860 Language: EnglishHindiMalayalam Extent: 1 volume (13 items, 36 folios)
52. ‘Vol 249 Persian correspondence’ Contributor: German Ambassador to Iran (correspondent) Date: 1858/1859 Language: EnglishFrench Geographic region: SherazFars Extent: 1 file (33 folios)
53. ‘Vol 250 Wrecks, Maritime outrages’ Contributor: Government of Bombay (correspondent)Political Agent, Persian Field Force (correspondent) Date: 1857/1861 Language: English Extent: 1 volume (156 folios)
54. ‘Vol 251 Unsettled affairs for Resident’s attention during Tour of Arab Ports, 1859/60; Turkish Arabia, Mohumrah [Khorramshahr], General’ Date: 1857/1860 Language: English Geographic region: MuscatZanzibar Extent: 1 file (55 folios)
55. 'Vol 255 Slave Trade' Date: 1857/1861 Language: English Geographic region: BahreinBassidoreShargahZanzibar Extent: 1 volume (184 folios)
56. 'Vol 259 Slave Trade' Contributor: Assistant to the Political Resident in the Persian Gulf (correspondent)Political Agent and Consul, Zanzibar (correspondent) Date: 1857/1861 Language: EnglishPersian Extent: 1 volume (237 folios)
57. ‘Vol 262 Historical Sketches and Administrative Reports’ Contributor: Assistant to the Political Resident in the Persian Gulf (correspondent) Date: 1857/1858 Language: English Extent: 1 volume (99 folios)
58. 'Vol 278 Slave Trade' Date: 1858/1862 Language: EnglishPersian Geographic region: Lingah Extent: 1 volume (225 folios)
59. 'Vol 282 Head IV, Volume 11 (eleven) Bahrein and Wahabee Complications' Contributor: Native Agent, Bahrain (correspondent)King of Bahrain (correspondent)Commander, HM sloop Falkland (correspondent)Commander, HM frigate Semiramis (correspondent)Shaikh of Demaum (correspondent) Date: 1859/1862 Language: EnglishArabicTurkish, Ottoman (1500-1928) Geographic region: BahreinBassidoreDemaumKatif Extent: 2 volumes (354 folios)
60. ‘Vol 37, 38, 40 Letters inward and outward’ Contributor: Government of Bombay, Civil Auditor (correspondent)HM Chargé d'Affaires to Persia (correspondent)Government of Bombay, Persian Secretary (correspondent)Senior Naval Officer in the Persian Gulf (correspondent)Political Agent, Turkish Arabia (correspondent)Shaikh Shaikh of the Āl Jalāhimah tribe Raḥmah bin Jābir Āl Jalāhimah (recipient) Date: 1825/1825 Language: EnglishArabic Geographic region: BussoraPirate Coast Extent: 1 volume, 59 items (92 folios)