Classification
GBH - Marine geology
7
GVA - Oceanography
7
GBHC - Ocean floor - sediments, morphology
3
GBAH - Stratigraphy, history of earth
2
GMP - Geochemical exploration
2
GBA - General geology, historical geology
1
GCAA - Regional geology - Germany
1
GCAB - Regional geology - european countries
1
GHH - Sedimentary petrography - general
1
GHHD - Sedimentary transport, sedimentation
1
GHHM - Diagenesis
1
GMA - Geochemistry - general
1
GMK - Geochemistry of elements, minerals, rocks
1