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1. Base exchange and related properties of the colloids of soils from the erosion experiment stations (id:CAT86200455)

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2. Base exchange and related properties of the colloids of soils from the erosion experiment stations (id:ORC00000009)

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3. Character and behavior of organic soil colloids (id:ORC00000008)

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4. Character and behavior of organic soil colloids (id:CAT86200371)