Mansfield, Edwin. <br/><br/>
The economics of technological change 

 - [1st ed.] 
 -  W. W. Norton New York  1968  [1968] 
 - x , 257 p. : ill. ; 25 cm. 
<br/><br/> Bibliographical footnotes 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Technological innovations -- United States.<br/>Research, Industrial -- United States.--HC
<br/><br/><label>LC Class. No.: </label>HC110.T4M3 1968