25. ‘Book 128’ Letters outward Date: 1841/1841 Language: English Geographic region: Trucial CoastBrymee
26. 'Book 130' Letters inward Date: 1840/1841 Language: English Geographic region: Trucial CoastEl Biddah
27. ‘Book 131’ Secret letters inward Date: 1840/1841 Language: English Geographic region: Trucial CoastZanzibarKarrack (island)Nos Beh (island)
28. 'Book 133' Secret letters inward Date: 1841/1842 Language: English Geographic region: Trucial CoastKarrack (island)Eastern Africa
29. 'Book 140 1843' letters inward Date: 1843/1843 Language: English Geographic region: Trucial Coast
30. ‘Book 158 1847-8’ Vol 158 Letters inward Date: 1847/1848 Language: English Geographic region: Trucial CoastEastern Africa
31. ‘Vol 125 Native letters inward’ Date: 1840/1841 Language: English Geographic region: Trucial CoastBahreinPersia
32. 'Vol 178 1852/53 Bahrain; Arabian Coast; Slave Trade; Muscat' Date: 1852/1852 Language: English Geographic region: Trucial Coast
33. 'Vol 195 1854/55 Bahrain; Arab Coast and Muscat; Slave Trade' Date: 1854/1855 Language: English Geographic region: Trucial CoastKateefLingahDemaum
34. 'File 38/1 II P. C. L. Exploration' Date: 1947/1949 Language: English Geographic region: Trucial CoastBuraimi
35. 'File 38/1 Vol I, P. C. L. Exploration' Date: 1945/1947 Language: English Geographic region: Jabal FaiyahBuraimiWadi Al GorTrucial Coast
36. ‘File 22/8 II SHAIKH OF DUBAI’ Date: 1941/1949 Language: English Geographic region: Trucial CoastDubai