History 27 Politics and government 20 Foreign relations 9 Thesis 9 Rule of the road at sea 7 Design and construction 6 Dissertations, Academic 6 Roads 6 World War, 1939-1945 6 Inland navigation 5 Law and legislation 5 Biography 4 Campaigns 4 Case studies 4 Economic conditions 4 Juvenile literature 4 National security 4 Pavements 4 Peace 4 Safety measures 4 World War, 1914-1918 4 Armed Forces 3 Conflict management 3 Congresses 3 Economic aspects 3 Economic development 3 Fiction 3 Great Britain 3 History, Military 3 Political activity 3