Ground Characterization and Structural Analyses for Tunnel Design / by Celada, Benjamn̕, editor, Bieniawski, Z. T., editor, Perez, Mario Fernandez, contributor, Sola, Juan Manuel Hurtado, contributor, Vicente, Isidoro Tardaguila, contributor, Eraso, Pedro Varona, contributor, Trivino, Eduardo Ramon Velasco, contributor