Clarke, G. R.
The study of the soil in the field / G.R. Clarke. - 4th ed. - Oxford : The Clarendon Press, 1936. - 204 p. : ill , ; 17 cm.
includes index.
Soil surveys.
The study of the soil in the field / G.R. Clarke. - 4th ed. - Oxford : The Clarendon Press, 1936. - 204 p. : ill , ; 17 cm.
includes index.
Soil surveys.