1. IOR/R/20/B/1-1060 Reference (shelfmark): IOR/R/20/B/1-1060 Title: Civil Secretary: Ordinary files Collection Area: India Office Records and Private Papers Languages: English Date Range: 1936-1942 Extent: 1061 files
2. IOR/R/20/B/1061-1608 Reference (shelfmark): IOR/R/20/B/1061-1608 Title: Civil Secretary: Confidential and Secret Files Collection Area: India Office Records and Private Papers Languages: English Date Range: 1938-1940 Extent: 548 files
3. IOR/R/20/B/1609-1677 Reference (shelfmark): IOR/R/20/B/1609-1677 Title: Civil Secretary: Confidential (annual series) files Collection Area: India Office Records and Private Papers Languages: English Date Range: 1938-1951 Extent: 69 files
4. IOR/R/20/B/1678-1994 Reference (shelfmark): IOR/R/20/B/1678-1994 Title: Civil Secretary: World War II Ordinary files Collection Area: India Office Records and Private Papers Languages: English Date Range: 1939-1942 Extent: 317 files
5. IOR/R/20/B/1995-1999 Reference (shelfmark): IOR/R/20/B/1995-1999 Title: Civil Secretary: World War II Secret and Confidential files Collection Area: India Office Records and Private Papers Languages: English Date Range: 1939-1940 Extent: 5 files
6. IOR/R/20/B/2000-2077 Reference (shelfmark): IOR/R/20/B/2000-2077 Title: Chief Secretary: Ordinary files Collection Area: India Office Records and Private Papers Languages: English Date Range: 1941-1957 Extent: 78 files
7. 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
8. IOR/R/20/B/2111-2149 Reference (shelfmark): IOR/R/20/B/2111-2149 Title: Chief Secretary: Most secret files Collection Area: India Office Records and Private Papers Languages: English Date Range: 1941-1955 Extent: 38 files
9. 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
10. IOR/R/20/B/2340-2376 Reference (shelfmark): IOR/R/20/B/2340-2376 Title: Chief Secretary: Intelligence Summary files Collection Area: India Office Records and Private Papers Languages: English Date Range: 1941-1952 Extent: 37 files