Classification
GCAC - Regional geology - noneuropean countries
4
GWBA - Raw material resources, raw material reserves
2
EFE - Petroleum geology
1
EFK - Petroleum deposits, natural gas deposits
1
GBAH - Stratigraphy, history of earth
1
GBE - Geology - endogene processes, exogene processes
1
GHHF - Sedimentary basins
1
GMAD - Organic geochemistry
1
GMP - Geochemical exploration
1