Columbia subject headings:
Ability.
Population--Statistics.
Reproduction--Statistics.
Seasons.
Weather--Psychological aspects.
Harvard subject headings:
Ability
Population--Statistics
Reproduction--Statistics.
Seasons
Weather--Physiological effect
Weather--Psychological aspects
Princeton subject headings:
Ability.
Population--Statistics.
Reproduction--Statistics.
Seasons.
Statistics.
Weather--Physiological effect.
Weather--Psychological aspects.