N. C. A. E. R., New Delhi <br/><br/>
Appraisal of demand for oxygen dissolved acetylene welding electrodes gas cylinders   

 - New Delhi  NCAER  1961 
 - 115P. 
<br/><br/>  
<br/><br/><label>Dewey Class. No.: </label>338.47671522(54)  / N277.AD