Nock, O. S. <br/><br/>
Underground railways of the world / 
O. S. Nock 
 - London :  Adam and Charles Black,  c1973 
 - x, 197 p., [7] p. of plates :  ill., diagrs., maps ;  25 cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label> PND 5.00 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Subways
<br/><br/><label>Dewey Class. No.: </label>625.42