History 50 Politics and government 32 Education 23 Biography 19 Agriculture 13 Economic conditions 12 Social conditions 12 Economic aspects 8 History and criticism 7 Universities and colleges 7 National income 6 Philosophy 6 Statesmen 6 Description and travel 5 Ethnology 5 Accounting 4 Economic policy 4 Land use 4 Political parties 4 Social life and customs 4 Teachers 4 World War, 1939-1945 4 Aboriginal Australians 3 Chemistry 3 Church history 3 Criticism and interpretation 3 Discovery and exploration 3 Education, Primary 3 Employment 3 Examinations 3