- 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/L13/13/1–3
Cumberland and Westmorland Territorial Forces' Associations
- D LONS/L13/13/1: File of minutes of meetings of the Cumberland and Westmorland Territorial Forces' Associations (and associated papers) which led to the formation of the Battalion - date: 15 - 23 September 1914
- D LONS/L13/13/2: Papers re the role of the Cumberland and Westmorland Territorial Forces' Associations in establishing the Battalion, including accommodation, funding, recruitment - date: 4 - 25 September 1914
- D LONS/L13/13/3: File re the Cumberland and Westmorland Territorial Forces' Associations and their role in setting up the Battalion, including agenda papers, minutes, report of the Cumberland branch of the British Red Cross Society - date: 19 August 1914 - 26 August 1915
—For access to the above records please contact the Cumbria Archive Centre (Carlisle)