History 53 World War, 1939-1945 41 Foreign relations 21 Great Britain 12 Armed Forces 11 Biography 11 Politics and government 9 Dictionaries 7 Military policy 7 Airplanes, Military 6 Handbooks, manuals, etc 6 Law and legislation 6 Secret service 6 World War, 1914-1918 6 Aerial operations, British 5 Army 5 Economic aspects 5 Management 5 Pictorial works 5 Campaigns 4 Colonies 4 Education, Higher 4 Regimental histories 4 Special forces (Military science) 4 Defenses 3 Directories 3 Handbook, manual, etc 3 History, Naval 3 Law 3 Military leadership 3