Soils and men :  yearbook of agriculture, 1938 

 - Washington :  United States Department of agriculture,  1938 
 - 1232 p: :  ill., cartes, graph., tab., index, glos. 
<br/><br/>bibliogr. p. 1181-1207 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Géographie rurale<br/>Agriculture<br/>Sol