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CHARLES G DARWIN The Law of Population
PAUL B SEARS The American Environ
FREDERICK H OSBORN Overpopulation and
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achieved Africa agriculture American areas Asia assortative mating average become biological birth control birth rate capita Catholic Church century cities civilization conservation contraception countries crease culture death rate defect disease earth economic effective effort environment estimated farms food production food supply Frank Fraser Darling future genetic Grenville Clark gross world product growing have-not human race improved India individual industrial internal-combustion engine Japan land Latin America less limit mankind means ment million modern National Park nature organization overpopulation peace percent planet planned parenthood planning political popu population density population explosion population growth population increase population pressures population problem possible poverty present programs rate of population reduced revolution Roman Catholic Roman Catholic Church social society Solly Zuckerman species standard of living studies tion trends underdeveloped United Nations University world law world population York