English language 9 Juvenile literature 9 Textbooks for foreign speakers 6 History 5 House cleaning 5 Household pests 5 Microbial ecology 5 Problems, exercises, etc 5 Economic conditions 3 Foreign relations 3 Handbooks, manuals, etc 3 Politics and government 3 Studies and exercises 3 Acculturation 2 Biography 2 China 2 Fishing 2 Foreign speakers 2 Management 2 Pictorial works 2 Study and teaching 2 Usage 2 Yugoslav War, 1991- 2 Accidents and injuries 1 Addresses, essays, lectures 1 Adolescent psychology 1 Aerial operations, British 1 Aeronautics 1 Airplanes 1 Allied occuption, 1943-1947 1