Johnson, P.S. <br/><br/>
The economics of invention and innovation: with a case study of the development of the hovercraft 
by P.S. Johnson 
 - London  Martin Robertson  1975 
 - 329p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ground-effect machines.<br/>Technological innovations
<br/><br/><label>Dewey Class. No.: </label>T25084 J63