Dobson.A.A.G. <br/><br/>
Railway Points &Crossings. 

 - 2nd Ed. 
 -  Temple Press Ltd. London.  1956 
 -  22 cm. 
<br/><br/><br/>Text in English 
<br/><br/><label>Subjects--Facted Index Terms: </label><br/>CIVI
<br/><br/><label>Index Terms--Genre/Form: </label><br/>C-14
<br/><br/><label>Dewey Class. No.: </label> / DOB