Any organic matter that has reached a point of stability

The formation of vegetable mould, through the action of worms : with observations on their habits / by Charles Darwin.

The formation of vegetable mould : through the action of worms, with observations on their habits / [Charles Darwin].

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Humus

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The formation of vegetable mould, through the action of worms : with observations on their habits / by Charles Darwin.

The formation of vegetable mould : through the action of worms, with observations on their habits / [Charles Darwin].