Soosalu askja 2007_seismic_project_scientific_report

Grossfeldt engineering qualification

Valgma orcid

Valgma oil shale_oil_production

Valgma possibilities for mitigating negative effects of noise and dust caused by extraction of sand, gravel and peat(2)

Valgma mining blasting

Valgma mining water

Valgma mining waste

Valgma losses

Valgma landscape

Valgma etis

Valgma infiltration dam_groundwater_regime

Valgma estonian oil_shale_resources_calculated_by_gis_method

Valgma cv academic_search

Valgma engineering qualification

Valgma d 2444-2009 - researcher id

Valgma an analysis_of_vegetation_restoration_on_opencast_oil_shale_mines_in_estonia

Valgma backfilling technologies for estonian oil shale mines(2)

Valgma google scholar citations

Pastarus paste-fills-technology-in-condition-of-estonian-oil-shale-mine