Factors
Entities
United States Geological SurveySaint LawrenceSmeltingFederal government of the United StatesRecyclingPresidency of George W. BushOreRadioactive decayAir pollutionGun controlUnited States Environmental Protection AgencyMissouriNational Rifle AssociationGeorge WashingtonPresidency of Barack ObamaThe Answer (band)National Ambient Air Quality StandardsEmily J. MillerHerculaneumLead–acid batteryAmmunition

