51. IOR/R/20/B/2078-2110 Reference (shelfmark): IOR/R/20/B/2078-2110 Title: Chief Secretary: Secret files Collection Area: India Office Records and Private Papers Languages: English Date Range: 1941-1958 Extent: 29 files
52. IOR/R/20/B/2150-2339 Reference (shelfmark): IOR/R/20/B/2150-2339 Title: Chief Secretary: Lands files Collection Area: India Office Records and Private Papers Languages: English Date Range: 1941-1963 Extent: 189 files
53. IOR/R/20/B/2781-3382 Reference (shelfmark): IOR/R/20/B/2781-3382 Title: Chief Secretary: Secret files Collection Area: India Office Records and Private Papers Languages: English Date Range: 1958-1964 Extent: 602 files
54. IOR/R/20/B/3445-3459 Reference (shelfmark): IOR/R/20/B/3445-3459 Title: Chief Secretary: Ordinary files Collection Area: India Office Records and Private Papers Languages: English Date Range: 1960-1965 Extent: 15 files
55. IOR/R/20/B/3502-3515 Reference (shelfmark): IOR/R/20/B/3502-3515 Title: District Commissioner's Office: miscellaneous files Collection Area: India Office Records and Private Papers Languages: English Date Range: 1942-1956 Extent: 14 files
56. IOR/R/20/B/3562 Reference (shelfmark): IOR/R/20/B/3562 Title: Anglo-Yemeni Conference: record of daily proceedings Collection Area: India Office Records and Private Papers Languages: English Date Range: Aug 1950-Oct 1950 Extent: 1 file
57. IOR/R/20/B/3577 Reference (shelfmark): IOR/R/20/B/3577 Title: Nationality files: Isaac Moses Cohen [G/140] Collection Area: India Office Records and Private Papers Languages: English Date Range: Dec 1962-Mar 1963 Extent: 1 file
58. IOR/R/20/B/2911 Reference (shelfmark): IOR/R/20/B/2911 Title: Colony Personalities: Collection Area: India Office Records and Private Papers Languages: English Date Range: Unspecified Extent: 1 file
59. IOR/R/20/B/3538 Reference (shelfmark): IOR/R/20/B/3538 Title: The Merchant Shipping (Confirmation of Legislation) (Aden) Order Collection Area: India Office Records and Private Papers Languages: English Date Range: 1955 Extent: 1 file
60. IOR/R/20/B/3541 Reference (shelfmark): IOR/R/20/B/3541 Title: Aden Colony Internal Security scheme: 'Operation Anther' Collection Area: India Office Records and Private Papers Languages: English Date Range: 1958 Extent: 1 file