Classification
GVA - Oceanography
14
GBH - Marine geology
13
GBHC - Ocean floor - sediments, morphology
8
GMAD - Organic geochemistry
4
GBA - General geology, historical geology
3
GHA - Petrology - general
3
GMP - Geochemical exploration
3
GBAH - Stratigraphy, history of earth
2
GBAK - Paleontology
2
GBEA - Geochronology
2
GCAC - Regional geology - noneuropean countries
2
GDA - Engineering geology - general
2
GHH - Sedimentary petrography - general
2
GHHD - Sedimentary transport, sedimentation
2
GHHF - Sedimentary basins
2
GHMA - Clay, shale
2
EFE - Petroleum geology
1
GBEN - Tectonics
1
GCAA - Regional geology - Germany
1
GHHM - Diagenesis
1
GHM - Sedimentary rocks
1
GKA - Geophysics - general
1
GKKA - Geophysical well logging
1
GMA - Geochemistry - general
1
GMK - Geochemistry of elements, minerals, rocks
1
GWB - Raw materials - metals, nonmetals
1