Harris, Elwyn D., 1933- , <br/><br/>
The national aerospace plane :  cost considerations for the follow-on vehicle/ 
Elwyn D. Harris. 
 - 12 pages :  illustrations ;  28 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hypersonic planes--Economic aspects.<br/>Aerospace planes--United States.