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2
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Technologies for sustainable agriculture in the tropics : proceedings of two international symposia... / ed. John Ragland and Rattan Lal.
- American society of agronomy [etc.],
- 1993.
- Madison, WI :
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Urban environmental services in developing countries / by Jacqueline G. Coolidge, Richard C. Porter, Z. John Zhang.
- University of Wisconsin,
- 1993.
- Madison, WI :