Classification
GBAK - Paleontology
11
GBHC - Ocean floor - sediments, morphology
4
GBED - Glaciology
3
GBA - General geology, historical geology
2
GBEE - Isotope geology
2
GBEK - Plate tectonics, continental drift
2
GRBA - Climatology - general
2
EFE - Petroleum geology
1
EFK - Petroleum deposits, natural gas deposits
1
GBAH - Stratigraphy, history of earth
1
GBC - Paleoclimatology
1
GCAA - Regional geology - Germany
1
GHA - Petrology - general
1
GHHD - Sedimentary transport, sedimentation
1
GHMA - Clay, shale
1
GUAA - Geography - physical
1