Code of safety for ammonia 

 - New Delhi  Indian standards institution   1968 
<br/><br/> 3rd reprint May 1994<br/>(incorporating amendment no.1) 
<br/><br/><label>Subjects--Index Terms: </label>IS:4544-1968 
<br/><br/><label>Dewey Class. No.: </label>614.8:661.51