Population pressure, the environment, and agricultural intensification : variations on the Boserup hypothesis / Uma Lele, Steven W. Stone. Lele, Uma J. Stone, Steven W., 1964- Population density Africa, Sub-Saharan Case studies. Agricultural productivity Africa, Sub-Saharan Case studies. Agricultural intensification Africa, Sub-Saharan Case studies. Land use, Rural Africa, Sub-Saharan Case studies. HB2121 .L44 1989 338.18676 20 LEP Includes bibliographical references (p. 77-79). Washington, D.C. : World Bank, c1989. c1989. 1989 Text 79 p. : eng MADIA discussion paper ; 4 Africa, Sub-Saharan Africa, Sub-Saharan Africa, Sub-Saharan Africa, Sub-Saharan