Classification
GTAK - Hydrogeology
UPVC - Groundwater
6
GAN - Geosciences - mathematical methods, computer applications
5
GCAA - Regional geology - Germany
2
GBAA - Geology - textbooks
1
GBEN - Tectonics
1
GCA - Regional geology
1
GKA - Geophysics - general
1
GSC - Remote sensing
1
UHN - Landscape ecology
1
UPC - Water - general aspects
1
UPK - Water resources, water supply
1
UPT - Water pollution control and measurement
1
UPV - Special waters
1
UPVF - Surface waters - streams, rivers, lakes
1