Wallis, J. A. Nicholas Intensified systems of farming in the tropics and subtropics / J. A. Nicholas Wallis - Washington, D.C. : World Bank, c1997. - x, 203 p.; ill. - Paper - World Bank discussion papers . - World Bank discussion paper ; . ISBN: 0821339443 ISSN: Nat. Bib. No.: M Subjects--Topical Terms: *Agricultural systems--Tropics.Agricultural systems.Dry farming--Tropics.Dry farming. Dewey Class. No.: 630.913 W35 1997