Classification
GNA - Geology - soil sciences
48
URA - Soil chemistry
22
LCN - Ecology - soil sciences
16
LWH - Agriculture - soil sciences
11
GPA - Geobiology - general
2
LCNA - Soil microbiology
2
GMAD - Organic geochemistry
1
GRB - Climatology
1
LWW - Agriculture - transfer factors, radioagronomy
1
THL - Thermodynamics - technical aspects
1
YRA - Social studies
1