Search ResultsElectronic Resources 
by
Heddle, T.
ScienceDirect https://www.sciencedirect.com/science/book/9780080158297
Format:
Excerpt:
Problems and exercises.
by
Lovell, Eric James, author.
Format:
Excerpt:
pastoralists use to maintain access to water and pasture for livestock; minimize problems of land degradation

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