Classification
GPA - Geobiology - general
LWH - Agriculture - soil sciences
6
LWF - Agriculture - methods
2
USDE - Domestic waste, plastics, paper
2
UVW - Special effects of hazardous materials
2
GNA - Geology - soil sciences
1
LCK - Ecology - general aspects
1
LHH - Microbiology - methods
1
URA - Soil chemistry
1