Columbia subject headings:
Animal industry--Environmental aspects--United States.
Animal waste--Environmental aspects--United States.
Hazardous waste site remediation--Government policy--United States.
Livestock factories--Environmental aspects--United States.
Harvard subject headings:
Animal industry--Environmental aspects--United States.
Animal waste--Environmental aspects--United States.
Factory farms--Environmental aspects--United States.
Hazardous waste site remediation--Government policy--United States.
Princeton subject headings:
Animal industry--Environmental aspects--United States.
Animal waste--Environmental aspects--United States.
Factory farms--Environmental aspects--United States.
Hazardous waste site remediation--Government policy--United States.