History 6,042 General 5,806 Historia 5,222 Education 3,999 Educación 3,981 Ciencias sociales 2,874 Publicaciones periódicas 2,505 hơn ... Filosofía 2,486 Philosophy 2,388 Periodicals 2,343 Tecnología 2,139 Medicina 2,060 Psicología 2,060 Technology 2,048 Social Science 1,951 Science 1,862 Derecho 1,778 Literatura 1,617 Agricultura 1,600 Agriculture 1,549 Psychology 1,544 Study and teaching 1,490 Law 1,488 Literature 1,455 Research 1,449 History and criticism 1,418 Economía 1,409 Investigación 1,323 Politics and government 1,272 Management 1,246 ít hơn ...