Sociology 28 Crop improvement 16 Currency 14 Trade Union 14 Wage Act 14 Economics 12 Engineering 12 Expenditure 12 Income tax 12 Plant Breeding 12 Public debt 12 Taxation 12 personal saving 11 Viral chromosomes 10 Finance 9 Genetics 8 Capital 7 Commerce 7 Genes 7 Management 7 Meteorology 7 income 7 Plant physiology 6 Social work 6 Weather forecasting 6 Mutation 5 Social stratification 5 Biology 4 Demography 4 Gestalist laws 4