Concrete porous pipes :  for under-drainage : B.S. 1194. 

 - London:   British Standards Institution,   1955.  
 - 11 p. :  ill. ;  21 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Concrete
<br/><br/><label>Dewey Class. No.: </label>624.1834