Religious aspects 227,207
Research 199,948
Religion 154,642
Relations 123,976
Railroads 84,145
Roads 65,593
Race relations 58,274
Religious life 45,919
Russian literature 40,996
Regional planning 40,819
Russian language 35,304
Rural conditions 34,926
Real property 34,484
Rock music 33,775
Religious life and customs 32,820
Reference 32,055
Rhetoric 30,898
Refugees 30,786
Rural development 29,017
Rites and ceremonies 28,210
Rules and practice 24,859
Regimental histories 24,211
Rehabilitation 24,016
Reformation 21,971
Racism 20,826
Readers 20,327
RELIGION 20,247
Reading 19,846
Revolutionaries 18,767
Radio 16,703
Russian poetry 15,432
Roman law 14,944
Religions 14,762
Russian 14,674
Rabbis 14,631
Romanticism 14,343
Responsa 14,181
Rivers 13,910
Rare books 13,889
Representative government and representation 13,860
Renaissance 13,735
Religion and science 13,637
Revolutions 13,559
Rituals 13,191
Relations extérieures 12,700
Registers of births, etc 12,563
Retirement 11,920
Renewable energy sources 11,514
Radicalism 11,331
Rates 11,186
Religion and politics 11,087
Reorganization 11,005
Russians 10,997
Remote sensing 10,895
Retail trade 10,838
Registration and transfer 10,798
Recherche 10,422
Rap (Music) 10,328
Romans 10,309
Risk management 10,061
Refuse and refuse disposal 9,873
Reproduction 9,531
Religious education 9,361
Registers 9,336
Regionalism 9,185
Revenue 9,064
Reformed Church 9,060
Radio broadcasting 9,013
Race discrimination 9,000
Riots 8,934
Religion and state 8,923
Recreation 8,800
Radiation 8,695
Robotics 8,456
Reconstruction (1939-1951) 8,371
Rock musicians 8,323
Risk assessment 8,271
Religion and sociology 8,015
Race identity 7,858
Restaurants 7,844
Recruiting, enlistment, etc 7,834
Repentance 7,432
Romanies 7,427
Reclamation of land 7,231
Requiems 7,214
Right and left (Political science) 7,145
Radiography 7,052
Research, Industrial 6,812
Revenge 6,718
Rice 6,624
Russian fiction 6,448
Rule of law 6,419
Romances 6,225
Real estate business 6,170
Relations with women 6,118
Rating of 5,955
Reconstruction (U.S. history, 1865-1877) 5,887
Recruiting 5,838
Race 5,835
Reform 5,742