00274nam a2200097Ia 4500008004100000082001600041100001900057245005000076260004200126300000800168140113s9999    xx            000 0 und d  a631.47   J7  a"Clarke, G.R."  a"Study of the soil in the field, 4th edition"  a1957bOxford University PresscLondon  a204