Politics and government 1,576,340 Philosophy 317,198 Political science 290,142 Periodicals 284,896 Political aspects 120,269 Popular music 119,904 Piano music 107,455 Prevention 96,409 Population 88,442 Psychological aspects 88,248 Poetry 84,617 Psychology 84,248 Political activity 75,919 Presidents 68,378 PRO Gotham Book Mart (former owner) (Gotham Book Mart Collection copy) 59,533 Photography, Artistic 57,673 Pollution 53,374 Pictorial works 50,388 Politique et gouvernement 50,085 Public opinion 49,982 Public health 49,483 POLITICAL SCIENCE 48,825 Planning 48,742 Painting 47,336 Physics 46,840 Political parties 45,921 Prices 45,356 Politicians 44,615 Police 41,550 Peace 40,233 Political and social views 38,669 Painters 38,559 Physicians 37,818 Printing 37,650 Photography 37,528 Penn dissertations 37,109 Public lands 36,334 Plants 34,597 Private collections 32,558 Public welfare 31,669 Poverty 31,200 Political participation 30,630 Poor 30,280 Paleontology 30,145 Personnel management 29,053 Physiology 29,032 Publishers and publishing 27,794 Petroleum industry and trade 27,740 Philosophie 26,804 Popular culture 26,579 Psychoanalysis 25,563 Public administration 25,018 Postal service 24,999 Prisons 24,117 People with disabilities 23,961 Power resources 23,827 Patients 22,540 Painting, Chinese 22,442 Public buildings 21,945 Pensions 21,944 Physiological effect 21,849 Petroleum 21,127 Political corruption 20,925 Public Policy 20,864 Philosophers 20,381 Protection 20,009 Philosophy, Modern 19,541 Prisoners 19,350 Psychotherapy 19,027 Political prisoners 19,007 Prayer 18,941 Peasants 18,793 Portraits 18,637 Painting, Modern 18,536 Piano, Musique de 18,455 Political culture 17,939 Politics, Practical 17,745 Psychiatry 17,560 Penn theses 17,263 Production and direction 16,979 Palestinian Arabs 16,767 Philosophy, Chinese 16,716 Public schools 16,226 Psalms (Music) 15,797 PSYCHOLOGY 15,625 Public Health 15,608 Piano music, Arranged 15,296 Public works 15,273 Public contracts 15,044 Power (Social sciences) 14,816 Politique gouvernementale 14,689 Phonology 14,608 Press 14,527 Philosophy, Ancient 14,433 Physical geography 14,335 Piano trios 14,023 Personal narratives 13,757 PHILOSOPHY 13,668 Painting, Italian 13,481 Poetics 13,425