Indian Railway standard specification for tubular steel signal poles (tentative) / 
Railway Board, Ministry of Railways, Ministry of Transport, India ; Issued by Research Designs and Standards Organisation. 
 - Delhi :  Author,  1981. 
 - 8 p. ;  20 cm. 
 - IRS : S6 - 81. .
<br/><br/><label>Dewey Class. No.: </label>625.165(54)