= The formation of vegetable mould, through the action of worms, with observations on their habits by Charles Darwin
{c}
{tag=Work by Charles Darwin}
{title2=1881}
https://www.gutenberg.org/files/2355/2355-h/2355-h.htm
ChapterIII,pp121–163: fine earth carried to the surface, progressive burial of objects, stony field and measured mould layers. Public-domain author text; alternative original edition record https://darwin-online.org.uk/converted/published/1881_Worms_F1361/1881_Worms_F1361.html .
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