Handbooks, manuals, etc 51 Civil service -- 30 Automobiles -- 25 Maintenance and repair 21 Management 20 Study guides 20 Data processing 18 more ... Employees -- 18 Islam 18 Islam -- 18 Examinations -- 15 Design and construction 13 Electronics 13 Study and teaching 13 Training of 13 Certification 12 Education -- 12 Engineering -- 12 Microcomputers 12 Problems, exercises, etc 12 Programming 12 Public administration -- 12 Electronic data processing personnel -- 11 Microprocessors 11 Digital electronics 10 Electronic circuits 10 Microsoft software -- 10 Business -- 9 Computer networks 9 Computer networks -- 9 less ...