Eight captioned albums of photographs relating to Leonard's service as Medical Officer with the Anglo-French expedition in the Cameroons (1914-1916) and with the Nigerian Brigade in German East Africa (1916-1918).
Also, a diary describing Leonard's medical service in Southern Nigeria (1907); letters, maps and photographs relating to his medical service in West Africa (1907-1931), and an album of photographs of service in South Africa, Grenada and St. Vincent (c.1901-1905).