Mansfield, Edwin <br/><br/>
The economics of technological change 
by Edwin Mansfield 
 - London  Longmans  1969 
 - 257p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Research, Industrial --United States.<br/>Technological innovations --United States
<br/><br/><label>Dewey Class. No.: </label>T25084 M318