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RESEARCH INVESTIGACI�ON 1,454 METHODOLOGY 697 EDUCATION 593 SOCIAL SCIENCES 438 EDUCACI�ON 420 SCIENCE 315 CIENCIA 253 CIENCIAS SOCIALES 209 INVESTIGACIONES 181 SOCIOLOGY 174 METODOLOG�IA 151 SOCIOLOG�IA 123 AGRICULTURE 115 EDUCATION, HIGHER 109 GENERAL 109 EDUCACI�ON SUPERIOR 108 INVESTIGACIÓN 108 INVESTIGACIÓN 107 AGRICULTURA 104 HISTORY 95 QUALITATIVE RESEARCH 92 MEDICINA 90 STUDY AND TEACHING 83 SOCIAL ASPECTS 73 EXPERIMENTACI�ON 71 EXPERIMENTATION 71 BIOCHEMISTRY 70 ENSE�NANZA SUPERIOR 70 MEDICINE 68