Religious aspects 227,995
Research 200,542
Religion 155,385
Relations 124,369
Railroads 84,292
Roads 65,644
Race relations 58,636
Religious life 46,044
Russian literature 41,115
Regional planning 40,886
Russian language 35,358
Rural conditions 35,009
Real property 34,631
Rock music 33,856
Religious life and customs 32,944
Reference 32,057
Rhetoric 30,999
Refugees 30,990
Rural development 29,069
Rites and ceremonies 28,269
Rules and practice 24,939
Regimental histories 24,226
Rehabilitation 24,069
Reformation 21,984
Racism 20,981
Readers 20,330
RELIGION 20,240
Reading 19,878
Revolutionaries 18,869
Radio 16,735
Russian poetry 15,518
Roman law 14,975
Religions 14,782
Russian 14,700
Rabbis 14,698
Romanticism 14,352
Responsa 14,215
Rivers 13,952
Rare books 13,931
Representative government and representation 13,885
Renaissance 13,703
Religion and science 13,656
Revolutions 13,629
Relations extérieures 13,485
Rituals 13,243
Registers of births, etc 12,586
Retirement 12,001
Renewable energy sources 11,634
Radicalism 11,380
Revenue 11,367
Rates 11,193
Religion and politics 11,120
Russians 11,032
Reorganization 11,021
Remote sensing 10,920
Retail trade 10,849
Registration and transfer 10,815
Recherche 10,690
Rap (Music) 10,362
Romans 10,246
Risk management 10,086
Refuse and refuse disposal 9,904
Reproduction 9,550
Religious education 9,375
Registers 9,336
Regionalism 9,217
Reformed Church 9,069
Race discrimination 9,067
Radio broadcasting 9,059
Recreation 8,963
Riots 8,956
Religion and state 8,954
Radiation 8,700
Robotics 8,525
Reconstruction (1939-1951) 8,385
Rock musicians 8,350
Risk assessment 8,293
Religion and sociology 8,036
Restaurants 8,019
Race identity 7,927
Recruiting, enlistment, etc 7,842
Romanies 7,453
Repentance 7,440
Reclamation of land 7,238
Requiems 7,229
Right and left (Political science) 7,200
Radiography 7,059
Research, Industrial 6,808
Revenge 6,764
Rice 6,631
Russian fiction 6,466
Rule of law 6,441
Romances 6,247
Real estate business 6,180
Relations with women 6,125
Rating of 5,960
Reconstruction (U.S. history, 1865-1877) 5,872
Race 5,856
Recruiting 5,843
Reform 5,731