Lecture notes and papers of Sir Thomas Hope Troubridge (1895-1949) while at the Royal Naval College, Greenwich, including 'The Naval Aspect of Combined Operations' by Commander Leach, RN, Three caricatures: Royal Air Forces, Royal Navy and British Army, 'Minor Combined Operation, "LABOR OMNIA VINCIT": the joint work of Commander Renouf, Lt-Commander T Troubridge and Lt- Commander Creasy, 1925, 'Combined Operations, I-III' by Lt-Colonel Foster, RM, 'Bases' by Commander J. Harding, RN, 1930 and 'Combined Operations, Camberley, 1925'.