By Langefors, Ulf..
Bilbao : Ediciones Urmo, 1987 .
459 páginas : , Incluye glosario técnico español, inglés, sueco. 8431404701

Place hold on Técnica moderna de voladura de rocas /

Johannesburg : South African Institute of Mining and Metallurgy, 1984 .
xvi, 363 pages : , "Proceedings of the Symposium on Seismicity in Mines organized by the South African National Group on Rock Mechanics and the South African Institute of Mining and Metallurgy"--Facing t.p. | Held in 9/82, in Johannesburg, South Africa. 062006708X

Place hold on Rockbursts and seismicity in mines /