Congresses 512 Periodicals 188 Agriculture 144 Economic aspects 143 Research 132 Environmental aspects 112 Economic policy 76 more ... Law and legislation 76 Education 70 Economic conditions 69 Government policy 66 Handbooks, manuals, etc 66 Study and teaching 65 Food supply 60 Pollution 59 City planning 58 Sustainable development 57 History 56 Case studies 55 Management 55 Environmental policy 53 Statistics 52 Finance 51 Analysis 48 Bibliography 48 Food 47 Nutrition 46 Psychology 46 Economic development 44 Social aspects 44 less ...