Roland, Conrad <br/><br/>
Frei Otto  tension structures / 
by Conrad Roland ; translated by C. V. Amerongen 
 - New York :  Praeger,  1970 
 - 172 p. :  ill. ;  22 cm. 
<br/><br/><label>LCCN: </label>69-19188 
<br/><br/><label>Subjects--Personal Names: </label><br/>Otto, Frei, 1925
<br/><br/><label>Subjects--Topical Terms: </label><br/>Lightweight construction