The study of soil in the field /
Clarke, George Robin.
The study of soil in the field / by G. R. Clarke assisted by Philip Beckett. - 5th ed. - Oxford: Clarendon, 1971. - xi, 145 p. : ill. ; 23 cm.
Bibliography: p. 139-141.
0198541171
Soil surveys
The study of soil in the field / by G. R. Clarke assisted by Philip Beckett. - 5th ed. - Oxford: Clarendon, 1971. - xi, 145 p. : ill. ; 23 cm.
Bibliography: p. 139-141.
0198541171
Soil surveys