1. IOR/L/PS/20/MEMO1-20 Reference (shelfmark): IOR/L/PS/20/MEMO1-20 Title: Political and Secret Department Library: Memoranda: Afghanistan and the North West Frontier of India Collection Area: India Office Records and Private Papers Languages: English Date Range: 1809-1898 Extent: 20 volumes (215 files)
2. IOR/L/PS/20/MEMO21-24 Reference (shelfmark): IOR/L/PS/20/MEMO21-24 Title: Political and Secret Department Library: Memoranda: Central Asia Collection Area: India Office Records and Private Papers Languages: English Date Range: 1841-1885 Extent: 4 volumes (168 files)
3. IOR/L/PS/20/MEMO25-30 Reference (shelfmark): IOR/L/PS/20/MEMO25-30 Title: Political and Secret Department Library: Memoranda: Burma and the North East Frontier Collection Area: India Office Records and Private Papers Languages: English Date Range: 1871-1912 Extent: 6 volumes (41 files)
4. IOR/L/PS/20/MEMO31-38 Reference (shelfmark): IOR/L/PS/20/MEMO31-38 Title: Political and Secret Department Library: Miscellaneous Memoranda Scope & Content: Covers both internal and external subjects Collection Area: India Office Records and Private Papers Languages: English Date Range: 1856-1885 Extent: 8 volumes (196 files)
5. IOR/L/PS/20/MEMO39-43 Reference (shelfmark): IOR/L/PS/20/MEMO39-43 Title: Political and Secret Department Library: Memoranda: Seistan, Persia, Persian Gulf, Red Sea and Somali Coast Collection Area: India Office Records and Private Papers Languages: English Date Range: Unspecified Extent: 5 volumes (49 items)