00283nam a22001097a 4500082001300000100001500013245006400028260004400092300001300136942000700149999001700156  a625.7GUP  aGupta, B.L  aRoad, Railways, Bridges, Tunnels & Harbour Dock Engineering  aNew Delhi:bStandard Publishers,c2013.  a1267p. ;  cBK  c54195d54192