Religious aspects 227,618
Research 200,264
Religion 155,212
Relations 124,212
Railroads 84,231
Roads 65,628
Race relations 58,511
Religious life 45,977
Russian literature 41,066
Regional planning 40,855
Russian language 35,332
Rural conditions 34,980
Real property 34,582
Rock music 33,817
Religious life and customs 32,889
Reference 32,053
Rhetoric 30,952
Refugees 30,926
Rural development 29,047
Rites and ceremonies 28,245
Rules and practice 24,890
Regimental histories 24,205
Rehabilitation 24,041
Reformation 21,975
Racism 20,914
Readers 20,329
RELIGION 20,240
Reading 19,857
Revolutionaries 18,827
Radio 16,725
Russian poetry 15,500
Roman law 14,966
Religions 14,772
Russian 14,679
Rabbis 14,670
Romanticism 14,342
Responsa 14,197
Rivers 13,938
Rare books 13,910
Representative government and representation 13,872
Renaissance 13,691
Religion and science 13,648
Revolutions 13,610
Relations extérieures 13,284
Rituals 13,225
Registers of births, etc 12,574
Retirement 11,992
Renewable energy sources 11,605
Radicalism 11,355
Revenue 11,347
Rates 11,191
Religion and politics 11,101
Reorganization 11,018
Russians 11,017
Remote sensing 10,916
Retail trade 10,842
Registration and transfer 10,806
Recherche 10,615
Rap (Music) 10,343
Romans 10,242
Risk management 10,072
Refuse and refuse disposal 9,894
Reproduction 9,537
Religious education 9,365
Registers 9,336
Regionalism 9,210
Reformed Church 9,063
Radio broadcasting 9,051
Race discrimination 9,039
Recreation 8,951
Riots 8,947
Religion and state 8,936
Radiation 8,696
Robotics 8,496
Reconstruction (1939-1951) 8,379
Rock musicians 8,342
Risk assessment 8,282
Religion and sociology 8,023
Restaurants 8,007
Race identity 7,899
Recruiting, enlistment, etc 7,839
Romanies 7,444
Repentance 7,437
Reclamation of land 7,234
Requiems 7,226
Right and left (Political science) 7,176
Radiography 7,053
Research, Industrial 6,811
Revenge 6,749
Rice 6,629
Russian fiction 6,455
Rule of law 6,434
Romances 6,239
Real estate business 6,177
Relations with women 6,118
Rating of 5,958
Reconstruction (U.S. history, 1865-1877) 5,871
Race 5,850
Recruiting 5,840
Reform 5,730