00521nam a22001337a 4500008004100000040005500041080002300096245014700119260005200266300001500318650000900333653001500342700003000357230512b        |||||||| |||| 00| 0 eng d  aNational Science LibrarycNational Science Library  a552:531(082.2)bL0  aRock mechanics theory and practice c/ Proceedings eleventh symposium on rock mechanics held at the university of California, 16-19 June, 1969  aNew York: bSociety of mining engineers, c1970  aix, 762p.   aRock  aEducation 10aSomerton, Wilbur H (Ed.)