Classification
URA - Soil chemistry
25
GNA - Geology - soil sciences
18
LCN - Ecology - soil sciences
2
UHN - Landscape ecology
2
GBAA - Geology - textbooks
1
GBEU - Weathering
1
GCAA - Regional geology - Germany
1
GHA - Petrology - general
1
GMAD - Organic geochemistry
1
GMK - Geochemistry of elements, minerals, rocks
1
GRB - Climatology
1
GTAK - Hydrogeology
1
LWO - Agricultural ecology, sustainable agriculture
1
THL - Thermodynamics - technical aspects
1
UCE - Environmental impact, environmental pollution
1
UCS - Environmental chemistry
1
UPVC - Groundwater
1
UXA - Environmental radioactivity
1
YRA - Social studies
1