Wilson, H. Raynar <br/><br/>
Mechanical railway signilling :  second and revised edition of railway signalling / 
by H. Raynar Wilson 
 - London :  Railway Engineer,  [n.d.] 
 - 193, xix p. ;  29 cm. 
<br/><br/> Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electronic mail systems--Evaluation<br/>Wireless communication systems
<br/><br/><label>Dewey Class. No.: </label>131