Symposium on Underground Mining,Louisville,1975 Symposium on Undeground Mining,2d.Louisville,1976 Symposium on Undeground Mining,2d.Louisville,1975 Symposium on Underground Coal Mining,Lousiville,1979 Symposium on hydraulic fluids Symposium on Seed Proteins Symposium on nutrition Symposium on Subsidence in Mines Symposium on Raise and Tunnal Boring Symposium on Free Boundary Problems
