Authors: UIBOPUU L

Citation: L. Uibopuu, THE STORY OF OIL-SHALE MINING RESEARCH, Gorucie slancy, 15(2), 1998, pp. 206-209

Authors: ADAMSON A REINSALU E UIBOPUU L

Citation: A. Adamson et al., ABOUT THE OUTSET OF MINING IN ESTONIA, Gorucie slancy, 12(1), 1995, pp. 79-86