Gehrs ,J,H <br/><br/>
Soil & crops 
Gehrs ,J,H 
 - New york  Macmillan and co  1924 
 - 440 pages 
<br/><br/><br/>In English 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soil
<br/><br/><label>Dewey Class. No.: </label>ogia,16  1924