Tough, John M. <br/><br/>
Passenger conveyors :  an innovatory form of communal transport / 
John M. Tough and Coloman A. O'Flaherty. 
 - London :  Allen,  1971. 
 - 176 p. :  16 plates, ill., plans. 
<br/><br/><label>ISBN: </label>0711001898 
<br/><br/><label>LCCN: </label>93044263     
<br/><br/><label>Subjects--Topical Terms: </label><br/>Passenger conveyors.<br/>Transportation--Passenger traffic.