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MARSTON BATES Man as a Member of a Bio
CHARLES G DARWIN The Law of Population
PAUL B SEARS The American Environ
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achieved Africa agriculture American areas assortative mating average become biological birth control birth rate capita Catholic Church century cities civilization conservation contraception countries crease culture death rate defect demographic disease earth economic effective effort environment estimated farms food production food supply future genetic 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 natural environment nature organization overpopulation Pakistan 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 scientific social society SOLLY ZUCKERMAN species standard of living studies tion trends underdeveloped United Nations University world law world population York