Rock mechanics for underground mining Symposium on Underground Mining,Louisville,1975 Symposium on Undeground Mining,2d.Louisville,1976 Symposium on Undeground Mining,2d.Louisville,1975 A symposium on textile printing Symposium on nutrition Symposium on Raise and Tunnal Boring Symposium on Underground Coal Mining,Lousiville,1979 Symposium on Free Boundary Problems A symposium on light and life