00424nam a2200157 a 4500008004100000020000700041100001900048245004400067300002900111500002000140504004400160650003500204003000100239005001700240040000900257                                          a??  aSzechy, Karoly 4aThe Art of tunnelling /cKaroly Szechy.  a891 p. :bill. ;c25 cm.  aIncludes index.  aIncludes bilbliographical references.    a Civil engineeringxtunnelling20230123134313.0  cNUST