Columbia subject headings:
Biological warfare--Congresses.
Chemical warfare--Congresses.
Civil defense--United States--Congresses.
Harvard subject headings:
Biological warfare--Congresses.
Chemical warfare--Congresses.
Civil defense--United States--Congresses.
Princeton subject headings:
Biological warfare--Congresses.
Chemical warfare--Congresses.
Civil defense--United States--Congresses.