Classification
GBA - General geology, historical geology
15
GKA - Geophysics - general
10
GKAF - Geomagnetism
6
AFK - Research institutions - Germany
3
GAA - Geosciences - reference books
3
GBE - Geology - endogene processes, exogene processes
3
GKK - Geophysics - applications
3
PEA - Electromagnetism
3
PEB - Electromagnetic fields
2
FKA - Magnetism - general aspects
1
FKC - Magnetism - specific aspects
1
GBAA - Geology - textbooks
1
GBAH - Stratigraphy, history of earth
1
GDAB - Rock mechanics, soil mechanics
1
GHH - Sedimentary petrography - general
1
GTAK - Hydrogeology
1
LGO - Sociobiology, ethology
1
LGR - Animal physiology
1
MLA - Potential theory
1
PLA - Astrosciences - general
1