Columbia subject headings:
Harvard subject headings:
Microwaves--Health aspects--History.
Microwaves--Health aspects.
Microwaves--Physiological effect
Microwaves--Safety regulations--United States.
Princeton subject headings:
Microwaves--Hygienic aspects--History.
Microwaves--Hygienic aspects.
Microwaves--Physiological effect.
Microwaves--Safety regulations--United States.