The Different Types of Earthworms: Understanding Epigeic, Endogeic, an – Turner's Worms

Earthworm Ecological Groups, Great Lakes Worm Watch

The Earthworms: Charles Darwin's Ecosystem Engineer

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Vermicompost - Wikipedia

Bacteria and earthworms - microbewiki

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UK Centre for Ecology & Hydrology

Earthworm Ecological Groups, Great Lakes Worm Watch

Earthworm ecology Earthworm Society of Britain

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