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The price of soil erosion : an economic evaluation of soil conservation and watershed development [Monografia] / J. de GraaffPublication: Wageningen : Wageningen Agricultural University, [19--?]Description: 298 p. ; 25 cmAvailability: No items available :

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Monitoring and evaluation of soilconservation and watershed development projects [Monografia] ; Edited by Jan de Graaff... [et al.]Publication: Enfield : WASWC, 2007Description: XVIII, 532 p. : il. ; 24 cmAvailability: Items available for loan: Biblioteca da ESA-IPBCall number: P30-39 (1).

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