Rapid excavation and tunneling conference, Los Angeles, California, 1989 : proceedings /
editors, Robert A.Pond, Patric B. Kenny.
- New York : Society of Mining Engineers, 1989.
- xii, 881p : ill.
92023122
Tunneling--Congresses.
Excavation--Congresses.
Underground construction--Congresses.
624 / .19
92023122
Tunneling--Congresses.
Excavation--Congresses.
Underground construction--Congresses.
624 / .19