Duncan, George A. <br/><br/>
Poy-tube heating-ventilation systems and equipment 

 - Lexington, Kentucky :  University of Kentucky,  (197?) 
 - 9 h.  : ilus. 
<br/><br/> Fotocopia 
<br/><br/><label>LCCN: </label>59588 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Invernaderos.<br/>Refrigeración.