- 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/L13/13/153–164
School of Musketry, Strensall
- D LONS/L13/13/153: Papers re arrangements for training at the School of Musketry, Strensall - date: 1 June - 16 August 1915
- D LONS/L13/13/154: Rolls and registers of range practices, No. 2 platoon - date: August 1915
- D LONS/L13/13/155: Rolls and registers of range practices, No. 3 platoon - date: August 1915
- D LONS/L13/13/156: Rolls and registers of range practices, No. 4 platoon - date: August 1915
- D LONS/L13/13/157: Rolls and registers of range practices, No. 4 platoon - date: August 1915
- D LONS/L13/13/158: Registers and rolls of range practices, A company - date: August 1915
- D LONS/L13/13/159: Rolls and registers of range practices, No. 14 platoon - date: August 1915
- D LONS/L13/13/160: Rolls and registers of range practices, No. 15 platoon - date: August 1915
- D LONS/L13/13/161: Rolls and registers of range practices, No. 16 platoon - date: August 1915
- D LONS/L13/13/162: Rolls and registers of range practices, D company - date: August 1915
- D LONS/L13/13/163: Rolls and registers of range practices - date: 7 - 11 August 1915
- D LONS/L13/13/164: Musketry scores, A, C and D companies - date: August 1915
—For access to the above records please contact the Cumbria Archive Centre (Carlisle)