Newbigin, Marion I <br/><br/>
Tillers of the ground 

 - London  Macmillan and co. ltd.  1925 
 - viii,223p.; 18cm. 
 - Readable books in natural knowledge .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture cultivation<br/>Cultivation<br/>food plants<br/>Plant breeding