Classification
GBAK - Paleontology
14
GVA - Oceanography
13
GBA - General geology, historical geology
10
GBC - Paleoclimatology
10
GBAH - Stratigraphy, history of earth
7
GBHC - Ocean floor - sediments, morphology
7
GBH - Marine geology
6
GBEA - Geochronology
3
GBED - Glaciology
3
GBEK - Plate tectonics, continental drift
3
GCAA - Regional geology - Germany
3
GHH - Sedimentary petrography - general
3
GAA - Geosciences - reference books
2
GBE - Geology - endogene processes, exogene processes
2
GCAC - Regional geology - noneuropean countries
2
GHHD - Sedimentary transport, sedimentation
2
GMAD - Organic geochemistry
2
GRBK - Climatological data
2
GUAA - Geography - physical
2
LBLC - Paleontology - biological aspects
2
EFE - Petroleum geology
1
EFK - Petroleum deposits, natural gas deposits
1
EFN - Petroleum exploration, natural gas exploration
1
GAN - Geosciences - mathematical methods, computer applications
1
GBER - Volcanism
1
GCA - Regional geology
1
GCAB - Regional geology - european countries
1
GHA - Petrology - general
1
GHHF - Sedimentary basins
1
GHHM - Diagenesis
1
GHMA - Clay, shale
1
GMAC - Isotope geochemistry
1
GMP - Geochemical exploration
1
GNA - Geology - soil sciences
1
GRB - Climatology
1
GRBA - Climatology - general
1
GWA - Raw material economy, raw material policy
1
GWBA - Raw material resources, raw material reserves
1
UCE - Environmental impact, environmental pollution
1
UCS - Environmental chemistry
1