Langa, Harry. <br/><br/>
Relative analgesia in dental practice :  inhalation analgesia and sedation with nitrous oxide / 
Harry Langa 
 - [Place of publication not identifed] :  [publisher not identified],  c1976 
<br/><br/> Relative analgesia in dental practice : inhalation analgesia and sedation with nitrous oxide, Relative 
<br/><br/><label>ISBN: </label>721656218 
<br/><br/><label>LC Class. No.: </label>RK 512.N55 .L36 1976