Penrose,H.E <br/><br/>
Principles and practice of radar 
H.E Penrose 
 - London  Geoerge newnes ltd  1949 
 - 691 
<br/><br/> Pg mean Physics General & Mechanics Page 457-464 in A to Z Accession Register (Acc. No. Pg1-Pg228) & Page 640 (Acc. No. 224-231) 
<br/><br/><label>Dewey Class. No.: </label>PG213