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Soil: What It Is and What It Does
Watch Soil: What It Is and What It Does (1966) : Full Movie Online Free Explains that different kinds of soil are mixtures of sand, clay, and humus; tells how the weathering of rocks helps make soil; includes simple experiments to show the kind of soil in which different plants grow well.
The Catastrophe Garden
Prehistoric Worlds
Closeness to the Land
Permaculture Soils
In Search of Balance
Botanist Francis Hallé Explains...
