Five letters and one testimonial addressed to Edgar William Cox and 'Mon General'. Includes: (MS Add. 9570/312) Letter from George Frederick Charles Searle to Cox, 16 June 1912 on how to address optical questions in a book probably a revised edition of a Textbook of Topographical and Geographical Surveying. ; (MS Add. 9750/313) letter from Walter Coote Hedley, Geographical Section, General Staff, War Office, Whitehall, SW to Cox, 30 April 1915 thanking him for 'your book on the Bosches' probably Cox's work on the order of battle of the German army; (MS Add. 9750/314); testimonial for Monsieur Le Colonel Kirke from P Wallner (Le Commandant Wallner) to Capt. Cox, 26 April [1915]; (MS Add. 9750/315) letter from Colonel Maxime Weygand to Mon General 27 April 1915 thanking him for six copies of 'The German Forces in the Field March 1915'; (MS Add. 9750/316) letter from [Retoulles] to 'Mon General', 29 April 1915 concerning 'Le Volume de L'Ordre de Bataille Allemand edite par le grand quartier general de larmee Britannique'; (MS Add. 9750/317) letter from B. T. Buckley to Cox, May 1914 with War Office stamp thanking Cox for his 'magnum opus'.