1. Mss Eur D597/1-2 Reference (shelfmark): Mss Eur D597/1-2 Title: Col William Youngson Collection Area: India Office Records and Private Papers Languages: English Date Range: Unspecified Extent: Unspecified
2. Mss Eur D597/1 Reference (shelfmark): Mss Eur D597/1 Title: Scope & Content: Financial correspondence and papers of Col Youngson Collection Area: India Office Records and Private Papers Languages: English Date Range: Dec 1797-Apr 1804 Extent: Unspecified
3. Mss Eur D597/2 Reference (shelfmark): Mss Eur D597/2 Title: Scope & Content: Other correspondence, consisting mainly of letters to and from his nephew Lieut [later Col] William Martin and others on the state of India and the course of the Napoleonic wars, 1801-15 Collection Area: India Office Records and Private Papers Languages: English Date Range: Aug 1801-Jul 1830 Extent: Unspecified