Finance 12,534 AIDS (Disease) 11,041 History 10,788 Law and legislation 10,370 Federal aid to education 5,548 Prevention 5,161 Education 5,144 more ... Study and teaching 4,967 Grants-in-aid 4,694 Government policy 4,566 Student aid 4,297 Computer-aided design 4,289 Aids and devices 4,185 Federal aid to transportation 4,067 Politics and government 4,022 Audio-visual aids 4,004 Teaching 3,987 General 3,914 Data processing 3,735 Research 3,649 Economic assistance, American 3,617 Histoire 3,575 Social aspects 3,440 Economic conditions 3,204 Public welfare 3,080 Appropriations and expenditures 3,063 Federal aid to higher education 2,933 Acquired Immunodeficiency Syndrome 2,879 HIV infections 2,852 Social conditions 2,714 less ...