P Ledent, C. P Beckervordersandforth, and V Chandelle (1980)
Linking study at great depth. In: Proceedings of the 6th Underground Coal Conversion Symposium,Shangri-La near Afton,Oklahoma,July 13-17
Underground Coal Conversion Symposium, vol. 6 p. II-1-10.
15226, 150, Ht, SYNAM, H, UCG
Document Actions