Columbia subject headings:
Microwaves--Environmental aspects--United States.
Microwaves--Health aspects--United States.
Microwaves--Physiological effect.
Harvard subject headings:
Microwaves--Environmental aspects--United States.
Microwaves--Health aspects--United States.
Microwaves--Physiological effect
Princeton subject headings:
Microwaves--Environmental aspects--United States.
Microwaves--Health aspects--United States.
Microwaves--Physiological effect.