Roofing in developing countires:   Research for new technologies 
/ National Academy of Sciences 
 - Washington:   National Academy of Sciences,   1974 
 - x, 74p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Building trade
<br/><br/><label>Subjects--Index Terms: </label>Roofing  
<br/><br/><label>Universal Decimal Class. No.: </label>69.024:624.024(04)  / L4;2