Thirsk, Wayne R. <br/><br/>
Factor substitution in colombian agriculture / 
Wayne R.Thirsk 
 - Houston, Texas :  Rice University,  1900 
 - 84 p. ;  26 cm. 
 - Program of development studies ;  no. 17 .
<br/><br/>Includes bibliographical references 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural laborers--Colombia