00351nam a2200121Ia 4500008004100000082001900041100001700060245003900077250001200116260004200128300001000170650004900180140224s9999    xx            000 0 und d  a631.473(42) H1  aClarke, G.R.  aThe study of the soil in the field  a3rd Ed.  aLondonbOxford University Pressc1941  a227p.  aSoil Survey-Geophysical methods,Soil science