1. IOR/Z/L/PS/20 Reference (shelfmark): IOR/Z/L/PS/20 Title: Political and Secret Department Library Collection Area: India Office Records and Private Papers Languages: English Date Range: c 1800-c 1945 Extent: 2 volumes
2. IOR/Z/L/PS/20/1 Reference (shelfmark): IOR/Z/L/PS/20/1 Title: List of the Political and Secret Department Library, with index Collection Area: India Office Records and Private Papers Languages: English Date Range: c 1800-c 1945 Extent: 2 volumes