Politics and government 1,577,522
Philosophy 317,494
Political science 290,225
Periodicals 284,996
Political aspects 120,577
Popular music 120,462
Piano music 107,594
Prevention 96,525
Population 89,218
Psychological aspects 88,423
Poetry 84,753
Psychology 84,355
Political activity 76,042
Presidents 68,447
PRO Gotham Book Mart (former owner) (Gotham Book Mart Collection copy) 59,533
Photography, Artistic 57,811
Pollution 53,399
Politique et gouvernement 51,274
Pictorial works 50,418
Prices 50,231
Public opinion 50,030
Public health 49,535
Planning 48,780
POLITICAL SCIENCE 48,767
Painting 47,354
Physics 46,870
Political parties 45,951
Politicians 44,688
Police 41,618
Peace 40,228
Political and social views 38,717
Painters 38,587
Physicians 37,835
Printing 37,667
Photography 37,545
Penn dissertations 37,284
Public lands 36,325
Plants 34,617
Private collections 32,558
Poverty 32,366
Public welfare 31,684
Political participation 30,667
Poor 30,302
Paleontology 30,153
Personnel management 29,066
Physiology 29,051
Petroleum industry and trade 28,516
Publishers and publishing 27,835
Philosophie 26,861
Popular culture 26,612
Psychoanalysis 25,562
Public administration 25,060
Postal service 25,003
Prisons 24,137
People with disabilities 24,038
Power resources 23,852
Patients 22,603
Painting, Chinese 22,451
Pensions 22,424
Public buildings 21,948
Physiological effect 21,855
Petroleum 21,136
Political corruption 20,973
Public Policy 20,867
Philosophers 20,411
Protection 20,098
Philosophy, Modern 19,573
Prisoners 19,377
Psychotherapy 19,107
Political prisoners 19,034
Prayer 18,995
Peasants 18,814
Portraits 18,646
Painting, Modern 18,569
Piano, Musique de 18,548
Political culture 17,962
Politics, Practical 17,712
Psychiatry 17,569
Penn theses 17,263
Production and direction 17,051
Palestinian Arabs 16,799
Philosophy, Chinese 16,732
Public schools 16,228
Psalms (Music) 15,804
Public Health 15,647
PSYCHOLOGY 15,609
Piano music, Arranged 15,319
Public works 15,272
Public contracts 15,047
Politique gouvernementale 15,043
Power (Social sciences) 14,834
Phonology 14,612
Press 14,536
Philosophy, Ancient 14,431
Physical geography 14,342
Piano trios 14,036
Personal narratives 13,731
PHILOSOPHY 13,635
Painting, Italian 13,485
Poetics 13,441