ISBN-13: 9783659834301 / Angielski / Miękka / 2016 / 100 str.
"The plough is one of the most ancient and most valuable of man's inventions, but long before he existed, the land was in fact regularly ploughed and still continues to be thus ploughed by earthworms". "The wonderful living Zoo of earthworms beneath our feet is active day and night, silently and secretly doing the job of decomposition and humification by burying organic debris and mixing inorganic and organic matters of their excreta with soil".