- 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/L13/13/165–177
Codford Camp
- D LONS/L13/13/165: Papers re Courts of Inquiry - date: 28 September - 6 October 1915
- D LONS/L13/13/166: Papers re training - date: 4 August - 12 November 1915
- D LONS/L13/13/167: Papers re musketry training including loan of arms, returns and progress reports - date: 24 July - 13 November 1915
- D LONS/L13/13/168-169: Diagrams and papers re tactical training exercises at Wensley and particularly at Codford - date: 17 August - 13 November 1915
- D LONS/L13/13/170: File re training in bomb and grenade throwing - date: 30 June - 16 November 1915
- D LONS/L13/13/171: Rolls and registers of range practices, No. 1 platoon - date: November 1915
- D LONS/L13/13/172: Rolls and registers of range practices, No. 2 platoon - date: November 1915
- D LONS/L13/13/173: Rolls and registers of range practices, No. 3 platoon - date: November 1915
- D LONS/L13/13/174: Rolls and registers of range practices, No. 15 platoon - date: November 1915
- D LONS/L13/13/175: Rolls and registers of range practices, No. 16 platoon - date: November 1915
- D LONS/L13/13/176: Rolls and registers of range practices, D company - date: November 1915
- D LONS/L13/13/177: File re training in the use of machine guns - date: 9 January - 3 December 1915
—For access to the above records please contact the Cumbria Archive Centre (Carlisle)