Lave, Lester B <br/><br/>
Technological chnage : its conception and measurement 

 - Englewood cliffs  Prentice - hall inc.  1966 
 - xx,288p.; 22cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Appalachian agriculture<br/>Empirical estimates<br/>Models measuring change<br/>Technological innovations