Haroldsen, Edwin O Heady, Earl O Mayer, Leo V Tweeten, Luther G <br/><br/>
Roots of the farm problem  changing technology, changing capital use, changing labour needs 

 - Ames  The Iowa state university press  1965 
 - viii, 224p.; 22cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Commodity supply<br/>Farm problem<br/>Farming<br/>Hired farm labour