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Mapping potential areas of ground subsidence in Estonian underground oil shale mining district

Valgma, I.* Mapping potential areas of ground subsidence in Estonian underground oil shale mining district // Proceedings of the 2nd International Conference "Environment. Technology. Resources" : Rezekne, Latvia, 25-27 June 1999. [S.l.], 1999. p. 227-232 : ill. https://www.researchgate.net/publication/271849044_Valgma_I_1999_Mapping_potential_areas_of_ground_subsidence_in_Estonian_underground_oil_shale_mining_district_In_Proceedings_of_the_2nd_International_Conference_Environment_Technology_Resources_Rezekne