Religious aspects 227,277
Research 199,993
Religion 154,803
Relations 124,032
Railroads 84,161
Roads 65,605
Race relations 58,416
Religious life 45,931
Russian literature 41,001
Regional planning 40,828
Russian language 35,309
Rural conditions 34,944
Real property 34,495
Rock music 33,781
Religious life and customs 32,836
Reference 32,056
Rhetoric 30,911
Refugees 30,847
Rural development 29,023
Rites and ceremonies 28,223
Rules and practice 24,860
Regimental histories 24,212
Rehabilitation 24,018
Reformation 21,972
Racism 20,844
Readers 20,327
RELIGION 20,257
Reading 19,848
Revolutionaries 18,778
Radio 16,706
Russian poetry 15,434
Roman law 14,946
Religions 14,779
Russian 14,674
Rabbis 14,634
Romanticism 14,346
Responsa 14,183
Rivers 13,919
Rare books 13,898
Representative government and representation 13,864
Renaissance 13,739
Religion and science 13,639
Revolutions 13,605
Rituals 13,198
Relations extérieures 12,838
Registers of births, etc 12,565
Retirement 11,921
Renewable energy sources 11,520
Radicalism 11,335
Rates 11,186
Religion and politics 11,091
Reorganization 11,005
Russians 10,996
Remote sensing 10,901
Retail trade 10,839
Registration and transfer 10,798
Recherche 10,466
Rap (Music) 10,329
Romans 10,319
Risk management 10,061
Refuse and refuse disposal 9,874
Reproduction 9,541
Religious education 9,363
Registers 9,337
Regionalism 9,191
Revenue 9,064
Reformed Church 9,060
Radio broadcasting 9,018
Race discrimination 9,003
Riots 8,935
Religion and state 8,928
Recreation 8,802
Radiation 8,696
Robotics 8,461
Reconstruction (1939-1951) 8,379
Rock musicians 8,329
Risk assessment 8,273
Religion and sociology 8,020
Race identity 7,864
Restaurants 7,845
Recruiting, enlistment, etc 7,835
Repentance 7,433
Romanies 7,430
Reclamation of land 7,230
Requiems 7,217
Right and left (Political science) 7,149
Radiography 7,054
Research, Industrial 6,812
Revenge 6,721
Rice 6,626
Russian fiction 6,449
Rule of law 6,421
Romances 6,226
Real estate business 6,171
Relations with women 6,118
Rating of 5,956
Reconstruction (U.S. history, 1865-1877) 5,888
Recruiting 5,839
Race 5,836
Reform 5,755