Classification
GCAA - Regional geology - Germany
19
GCAB - Regional geology - european countries
13
GCA - Regional geology
7
GCAC - Regional geology - noneuropean countries
6
GBA - General geology, historical geology
3
GXAB - Polar research - antarctic region
3
GBAA - Geology - textbooks
2
GBAH - Stratigraphy, history of earth
2
GBEN - Tectonics
1
GBH - Marine geology
1
GBHB - Geology of continental shelves
1
GDA - Engineering geology - general
1
GFAA - General mineralogy
1
GHA - Petrology - general
1
GKAA - Earth crust, earth mantle, earth core
1
GMAC - Isotope geochemistry
1
GTAK - Hydrogeology
1
GUA - Geography - general
1
GUAA - Geography - physical
1
GWA - Raw material economy, raw material policy
1
LCP - Limnology
1
UEN - Environmental economy
1