History 30 Leadership 23 Handbooks, manuals, etc 18 Organization 15 Personnel management 15 Piloting 15 Malay fiction 14 Management 14 Juvenile literature 13 Politics and government 13 Private flying 13 Airplanes 12 Islam 11 Foreign relations 10 Instrument flying 9 Intelligence service 9 Aeronautics 7 Biography 7 English fiction 7 Marketing 7 Religious aspects 7 Thesis 7 Armed Forces 6 Decision making 6 Electronic data processing 6 Examinations 6 Study and teaching 6 Study guides 6 Unidentified flying objects 6 Women 6