Politics and government 356 Personnel management 267 Philosophy 255 Probabilities 179 Problems, exercises, etc 169 Prices 165 Production management 149 Pollution 135 Planning 121 Power resources 121 Programming 121 Political science 105 Psychological aspects 100 Portfolio management 96 Project management 96 Population 91 Periodicals 86 Political aspects 78 Petroleum industry and trade 67 Psychology 63 Public administration 63 Prevention 62 Political economy 57 Poverty 54 Programming (Mathematics) 53 Public welfare 51 Psychology, Industrial 49 Process control 48 Programming languages (Electronic computers) 47 Protection 40 Public relations 39 Problem solving 35 Public health 33 Physical distribution of goods 32 Physics 32 Product management 32 Production (Economic theory) 32 Parallel processing (Electronic computers) 31 Purchasing 31 Photography 28 Programming languages 25 Policy sciences 24 Pricing 24 Production control 24 Performance 23 Poor 23 Production planning 23 Pensions 22 People with disabilities 22 Physiology 22 Politics 21 Privatization 21 Property 21 Public law 21 Peace 19 Petroleum products 19 Pictorial works 19 Profit 19 Public opinion 19 Painters 18 Public utilities 18 Political parties 17 Production 17 Production engineering 17 Programmed instruction 17 Pattern perception 16 Pattern recognition systems 16 Petroleum 16 Privacy, Right of 16 Produce trade 16 Psychoanalysis 16 Python (Computer program language) 16 Partnership 15 Pascal (Computer program language) 15 Poets, Greek 15 Power (Social Sciences) 15 Psychometrics 15 Public-private sector cooperation 15 Packaging 14 Pension trusts 14 Political activity 14 Political participation 14 Presidents 14 Protectionism 14 Purification 14 Passenger traffic 13 Point processes 13 Politicians 13 Popular works 13 Public goods 13 Plant maintenance 12 Prolog (Computer program language) 12 Public works 12 Painting, Greek 11 Pharmaceutical industry 11 Political corruption 11 Politics and culture 11 Pressure groups 11 Production scheduling 11 Public economics 11