A shell of double curvature for roofs and floors / 
G. S. Ramaswamy....[et all] ; C. B. R. I, Govt. of India 
 - Roorkee :  C B R I,  [n. d. ] 
 - 23 p. :  ill. ;  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Roofing
<br/><br/><label>Dewey Class. No.: </label>695.3