Modern German boiler practice 

 - Düsseldorf :  Wasserrohrkessel-Verband,  ? -  
 - v. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MAQUINAS DE VAPOR<br/>CALDERAS<br/>TRANSMISION DE CALOR
<br/><br/><label>Universal Decimal Class. No.: </label>621