Social sciences 147 Research 136 History 122 Computer science 92 Plant Biotechnology 92 Statistics 88 Land use 86 Agriculture 80 Mathematics 79 Dissertations, Academic (Ph.D) 76 Biotechnology 75 Agronomy 74 Methodology 72 Philosophy 70 Economics 65 R (Computer program language) 64 methods 63 English language 61 Therapeutic use 61 Data processing 59 Education 57 Social aspects 57 Women 55 Management 53 Data mining 52 History and criticism 51 Mass media 49 Social conditions 48 Psychology 46 Qualitative research 44