Classification
URA - Soil chemistry
18
UPP - Water pollution
5
UPN - Water protection, water quality, clean water
4
LWH - Agriculture - soil sciences
3
UVF - Environmental aspects of heavy metals and their compounds
3
USGH - Contaminated sites
2
GHHD - Sedimentary transport, sedimentation
1
GNA - Geology - soil sciences
1
LCN - Ecology - soil sciences
1
UCGN - Control of environmental pollution - biological methods
1
UHCH - Urban areas
1