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Collecting the dirt on soils : advancements in plot-level soil testing and implications for agricultural statistics por Gourlay, S., Aynekulu, Ermias, Shepherd, Keith D., Carletto, C.

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Spectral Soil Analysis & Household Surveys: A Guidebook for Integration por Gourlay, S., Aynekulu, Ermias, Carletto, C., Shepherd, Keith D.

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