Roofing in developing countries :  research for new technologies. 

 - Washington :  NAS ,  1974 
 - x, 74+1p. :  ill. ;  23 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Building construction
<br/><br/><label>Dewey Class. No.: </label>690  / NAS