Classification
UPK - Water resources, water supply
46
GTA - Hydrology - general
20
UPN - Water protection, water quality, clean water
15
UPC - Water - general aspects
12
UPA - Water - handbooks
4
UPVC - Groundwater
4
GTAK - Hydrogeology
3
UMV - Climatic change
3
UPCE - Water chemistry
3
GAN - Geosciences - mathematical methods, computer applications
2
GMAB - Hydrogeochemistry
2
GSC - Remote sensing
2
LWE - Agriculture - general aspects
2
UAN - Environment - mathematical methods, computer applications
2
UCJ - Environmental protection - general aspects
2
UEA - Environmental policy and economy - general aspects
2
UEN - Environmental economy
2
UHN - Landscape ecology
2
UHP - Protection of nature and landscape
2
UPT - Water pollution control and measurement
2
USN - Waste water treatment
2
YEC - Law on waters
2
YPB - Economy - general aspects
2
FNF - Polymer science - general aspects
1
GBA - General geology, historical geology
1
GBEN - Tectonics
1
GCA - Regional geology
1
GCAA - Regional geology - Germany
1
GHHD - Sedimentary transport, sedimentation
1
GPAB - Flora, vegetation - geographical aspects
1
GRA - Meteorology
1
GRB - Climatology
1
GTAP - Hydrological investigation methods
1
GUAA - Geography - physical
1
GWBA - Raw material resources, raw material reserves
1
LCK - Ecology - general aspects
1
LCL - Biotopes, ecosystems
1
LCM - Terrestrial ecology
1
LCP - Limnology
1
LWF - Agriculture - methods
1
LWO - Agricultural ecology, sustainable agriculture
1
UA - Environment - general
1
UCQ - Environmental technology
1
UED - Environmental policy
1
UENG - Cost factors of water pollution and control
1
UHC - Area planning and environment
1
UMA - Atmospheric sciences
1
UPCK - Water models
1
USG - Waste treatment, waste disposal
1
USK - Waste water
1
more ...