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  1. 1
    A comparison of coffee soil and leaf analyses from three laboratories /

    A comparison of coffee soil and leaf analyses from three laboratories / by Harding, P. E.

    Published 1988
    “…PNG Coffee Research Institute…”
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  2. 2
    Foliar nutrient level studies in fertilised coffee in the Eastern and Western Highlands Provinces of Papua New Guinea /

    Foliar nutrient level studies in fertilised coffee in the Eastern and Western Highlands Provinces of Papua New Guinea / by Harding, Paul E.

    Published 1991
    “…PNG Coffee Research Institute…”
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