Excavation in tropical lateritic and saprolitic soils - Massad, Faiçal; Nakao, H; Marzionna, Jaime Domingos; Pedrosa, J A B A; Gehring, J G; Martins, M C R; Soares, M M; Rodriguez Alonso, Urbano; Braga, A S; Habiru, H; Heinz Junior, H K (Peculiarities of Geotechnical Behavior of Tropical Lateritic and Saprolitic Soils: Progress Report, 1982-1985, 1985)