por Symposium on Rock Mechanics (15 : 1973 : (Parque Estatal Custer, Dakota del Sur) | Hoskins, Earl R [editor] | South Dakota School of Mines and Technology | U.S. National Committee for Rock Mechanics.
por Symposium on Rock Mechanics (14 : 1972 : Pennsylvania State University) | Hardy, H. Reginald (Henry Reginald), 1931- [editor] | Stefanko, Robert, 1926- [editor].