21. IOR/Z/L/PS/13/20 Reference (shelfmark): IOR/Z/L/PS/13/20 Title: Political (Internal) Department Index Collection Area: India Office Records and Private Papers Languages: English Date Range: 1940 Extent: 1 volume
22. IOR/Z/L/PS/13/21 Reference (shelfmark): IOR/Z/L/PS/13/21 Title: Political (Internal) Department Index Collection Area: India Office Records and Private Papers Languages: English Date Range: 1941 Extent: 1 volume
23. IOR/Z/L/PS/13/22 Reference (shelfmark): IOR/Z/L/PS/13/22 Title: Register and Index to Political (Internal) Department Collections Scope & Content: Nos 1-48 Collection Area: India Office Records and Private Papers Languages: English Date Range: 1921-1948 Extent: 1 volume