Graham Vernon Jacks · 8 obras en el catálogoObrasEErosion and soil conservationErosion and soil conservationTThe influence of man on soil fertilityThe influence of man on soil fertilityLLand classification for land-use planningLand classification for land-use planningMMulchingMulchingMMultilingual vocabulary of soil scienceMultilingual vocabulary of soil scienceSSoilSoilTThe rape of the earthThe rape of the earthVVanishing landsVanishing lands