- Main article: List of Surviving Lonsdale Records
The list of Lonsdale Records relating to the Lowther family and the Earls of Lonsdale are stored at the Cumbria Record Office (Carlisle Headquarters). The Lowther Family Estate have thousands of records listed in various categories and sub-categories ranging from DLons/L5 to DLons/L25. The records relating to the 11th Border Regiment (Lonsdale) range from DLons/L13/13/1 to DLons/L13/13/282
D LONS/L13/13/135–146
Battalion and Daily Orders
- D LONS/L13/13/135: Battalion orders, Blackhall - date: 23 December 1914 - 12 January 1915
- D LONS/L13/13/136: Battalion orders 35-291, Blackhall - date: 14 January - 6 May 1915
- D LONS/L13/13/137: Daily orders, unnumbered, 25-106 Blackhall - date: 6 October 1914 - 7 May 1915
- D LONS/L13/13/138: Battalion orders 296-457 Prees Heath - date: 10 May - 21 June 1915
- D LONS/L13/13/139: Daily orders 107-143 Prees Heath - date: 10 May - 21 June 1915
- D LONS/L13/13/140: Battalion orders 458-555 Wensley - date: 23 June - 5 August 1915
- D LONS/L13/13/141: Daily orders 144-177 Wensley - date: 23 June - 5 August 1915
- D LONS/L13/13/142: Battalion orders 556-560 Strensall - date: 6 - 11 August 1915
- D LONS/L13/13/143: Daily orders 178-182 Strensall - date: 6 - 11 August 1915
- D LONS/L13/13/144: Battalion orders 561-638 Codford - date: 13 August - 22 November 1915
- D LONS/L13/13/145: Daily orders 183-259 Codford - date: 13 August - 22 November 1915
- D LONS/L13/13/146: District (No. 3, Preston) Orders, 243-334 - date: 17 May - 2 December 1915
—For access to the above records please contact the Cumbria Archive Centre (Carlisle)