Gustafson, A F <br/><br/>
Conservation of the Soil 

 - New York  Mc Graw-Hill Book Company  1937 
 - 312p. 
<br/><br/><label>Subjects--Uniform Titles: </label>--General Stack
<br/><br/><label>Subjects--Topical Terms: </label><br/>Techniques, equipment & materials--Botany--Soil
<br/><br/><label>Dewey Class. No.: </label>631.4  / GUS-C