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1.- New horizons in rock mechanics. Proceedings fourteenth symposium on rock mechanics held at the Pennsylvania State University, June 11-14, 1972 Hardy, H. R., Jr., ed.; Stefanko, R.; Congreso - Symposium on Rock Mechanics (14. 1972. State College, Pensilvania, Estados Unidos) Nueva York: American Society of Civil Engineers, 1973 Peñarroya S/5-4.15 Ver registro
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