De Camp, L. Sprague <br/><br/>
Citadels of mystery / 
L. Sprague De Camp and Catherine C. De Camp 
 - London :  Fontana Books,  1972 
 - xii, 292 p., [4] leaves of plates :  ill., maps, plans ;  18 cm. 
<br/><br/> "Formerly titled: Ancient ruins and archaeology"--On t.p.  Includes bibliographical references (p. 271-282) and index 
<br/><br/><label>ISBN: </label> 45p UK, ($1.50 AUS, $1.75 CAN) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Extinct cities