National Board inspection code;  a manual for boiler and pressure vessel inspectors. 

 - Columbus Ohio  National Board of Boiler and Pressure Vessel Inspectors   1973 
 - e, 194 p.  ill.    22 cm. 
<br/><br/> "An American national standard."  "ANSI/NB-<  >." 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Pressure vessels<br/>Steam-boiler inspection--United States.<br/>Steam-boilers
<br/><br/><label>Dewey Class. No.: </label>621.18 NAT 1973