Columbia subject headings:
Food supply--Lesotho--Mathematical models.
Policy sciences--Mathematical models.
Social change--Mathematical models.
Zimbabwe--Politics and government--1965-1979--Mathematical models.
Harvard subject headings:
Food supply--Lesotho--Mathematical models.
Policy sciences--Mathematical models.
Social change--Mathematical models.
Zimbabwe--Politics and government--1965-1979--Mathematical models.
Princeton subject headings:
Food supply--Lesotho--Mathematical models.
Policy sciences--Mathematical models.
Social change--Mathematical models.
Zimbabwe--Politics and government--1965---Mathematical models.