Media type: E-Article Title: The Causes of Land Degradation along "Spontaneously" Expanding Agricultural Frontiers in the Third World Contributor: Southgate, Douglas imprint: University of Wisconsin Press, 1990 Published in: Land Economics Language: Not determined DOI: 10.2307/3146686 ISSN: 0023-7639 Keywords: Economics and Econometrics ; Environmental Science (miscellaneous) Origination: Footnote: