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1
Soil conservation in an upland farming system in Iloilo a socio-economic survey
Julkaistu 1996Kirja -
2
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3
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4
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5
Soil conservation in an upland farming system in Bukidnon a socio-economic survey
Julkaistu 1995Kirja -
6
Soil conservation in an upland farming system in Palawan a socio-economic survey
Julkaistu 1995Kirja -
7