Columbia subject headings:
Harvard subject headings:
Chemical weapons disposal--Environmental aspects--Washington (D.C.)
Hazardous waste site remediation--Washington (D.C.)
Spring Valley (Washington, D.C.)--Environmental conditions.
Princeton subject headings:
Chemical weapons disposal--Environmental aspects--Washington (D.C.).
Hazardous waste site remediation--Washington (D.C.).
Spring Valley (Washington, D.C.)--Environmental conditions.