Title :
Challenges for the 21st century
Author Statement :
edited by T. Alten ...[et al.]
Publication :
A. A. Balkema
Collation :
2v. :ill.;26 cm
Subject :
Tunneling- Congresses
Holding Info. :
9058090639
SubTitle :
: proceedings of the World Tunnel Congressʹ99
Biblography :
Includes bibliographical references and index
