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Physical
effects of environment
Variation
and natural conditions
Stature
and environment
Physical
effects of dominant activities
Physical
effects of climate
Acclimatization
Pigmentation
and climate
Pigmentation
and altitude
Difficulty
of generalization from geographic distribution
Psychical
effects
Indirect
effect upon language
The
great man in history
Economic
and social effects
Size
of the social group
Effect
upon movements of peoples
River
routes
Segregation
and accessibility
Change
of habitat
Retrogression
in new habitat
The
Boers of South Africa
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