Classification
EFN - Petroleum exploration, natural gas exploration
4
GDA - Engineering geology - general
4
GKK - Geophysics - applications
4
EFE - Petroleum geology
2
GWBA - Raw material resources, raw material reserves
2
ECA - Energy resources
1
GHH - Sedimentary petrography - general
1
GHHD - Sedimentary transport, sedimentation
1
GHHF - Sedimentary basins
1
GHMB - Sandstone, conglomerate
1
GMA - Geochemistry - general
1
GMP - Geochemical exploration
1
GWA - Raw material economy, raw material policy
1
GWB - Raw materials - metals, nonmetals
1