[Map of area Castello Branco-Guarda-River Elga]. Quarter Master General's Office, Horse Guards. Novr. 1st, 1811 [Copy 2]., 1811., Adv.MS.46.10.1(32B). Correspondence and papers of General Sir George Murray., Adv.MSS.46.1.1-46.10.2. National Library of Scotland Archives and Manuscripts Division. https://nlssb.as.atlas-sys.com/repositories/2/archival_objects/68043 Accessed September 23, 2024.