Keller,Ulrich <br/><br/>
The building of the Panama canal in historic photographs 

 - New York  Dover  1983 
 - 11pp. 
<br/><br/><label>ISBN: </label>0-486-24408-3 
<br/><br/><label>Subjects--Index Terms: </label>Canales Ingenieria de las vias navegables Esclusas