Mathematics 18
Mortality 18
United States 16
Thermodynamics 14
Life expectancy 12
Chemistry 10
Food Composition 10
Hazardous wastes 8
Water-supply 8
Interest 7
Spectrum analysis 7
Food Analysis 6
Health surveys 6
Ionosphere 6
Irrigation water 6
Mathematical geography 6
Metric system 6
Nucleotide sequence 6
Physics 6
Tax administration and procedure 6
Tax credits 6
Airlines 5
Chemicals 5
Mathematical statistics 5
Mineralogy 5
Nuclear physics 5
Remainders (Estates) 5
Thermochemistry 5
Alcoholism Treatment 4
Alloys Testing 4
Atomic spectroscopy 4
Chemical kinetics 4
Chemistry, Organic 4
Child tax credits 4
Drug abuse Treatment 4
Earned income tax credit 4
Engineering 4
Food Tables 4
Gifts Taxation Rates and tables 4
Groundwater 4
Hydraulics Tables 4
Metals Testing 4
Mortality Methodology 4
Pensions 4
Petroleum 4
Science 4
Sick leave 4
Solubility 4
Substance abuse Treatment 4
Tax rebates 4
Trigonometry 4
Trusts and trustees 4
United States Climate 4
Analytical chemistry 3
Chemical equilibrium 3
Chronology, Historical 3
Coinage 3
Corn Varieties 3
Fluids Thermal properties 3
Food Weights and measures 3
Geochemistry 3
Geology 3
Hybrid corn 3
Hydrocarbons 3
Hydrocarbons Thermal properties 3
Hydrology 3
Igneous rocks 3
Inorganic compounds Thermal properties 3
Lumber trade 3
Metal ions 3
Meteorology, Agricultural History 3
Minerals 3
Mortality States 3
Multiemployer pension plans 3
Navigation 3
Neutron resonance 3
Older people Health and hygiene 3
Older people Medical care 3
Public health 3
Seismological stations 3
Solar radiation Measurement 3
Soybean 3
Soybean Varieties 3
Substance abuse treatment facilities 3
Substance abuse treatment facilities States 3
Thermal neutrons 3
Absorption spectra 2
Air 2
Air quality management 2
Air traffic capacity 2
Airlines Management 2
Airport noise 2
Argon 2
Assets (Accounting) Valuation 2
Astrophysics 2
Atmospheric temperature 2
Atmospheric temperature History 2
Beta functions 2
Blood Analysis 2
Building 2