Each soil has had its own history. Like a river, a mountain, a forest, or any natural thing, its present condition is due to the influences of many things and events of the past.
Soils: A Self-teaching Course (ed. 1945)
Each soil has had its own history. Like a river, a mountain, a forest, or any natural thing, its present condition is due to the influences of many things and events of the past.
Soils: A Self-teaching Course (ed. 1945)