na INLIS000000000003595 0010-0121001961 Intensified Systems of Farming in The Tropics and Subtropics J.A. Nicholas Wallis Washington, DC The World Bank 1997 xii, 203p, ill, 28 cm 0-8213-3944-3 WB. 631.58 WB. 631.58 TROPICS INTENSIFICATION SRY FARMING. 4847 4847