Columbia subject headings:
Acclimatization.
Human beings--Migrations.
Human skin color.
Light--Physiological effect.
Tropical medicine.
Harvard subject headings:
Acclimatization
Human beings--Migrations
Human skin color
Light--Physiological effect
Tropical medicine
Princeton subject headings:
Acclimatization.
Human beings--Migrations.
Human skin color.
Light--Physiological effect.
Tropical medicine.