Study of soil in the field
Clarke, G. R.
Study of soil in the field - 5th ed. - Oxford Clarendon Press 1971 - xi, 144 p.
Soil research
Soil surveys
631.47
Study of soil in the field - 5th ed. - Oxford Clarendon Press 1971 - xi, 144 p.
Soil research
Soil surveys
631.47