Classification
UPK - Water resources, water supply
134
UPN - Water protection, water quality, clean water
125
UPT - Water pollution control and measurement
119
USN - Waste water treatment
113
URA - Soil chemistry
98
GNA - Geology - soil sciences
86
UPCE - Water chemistry
82
GTA - Hydrology - general
78
UPP - Water pollution
70
UPVC - Groundwater
70
TNE - Water cooled reactors
58
UPC - Water - general aspects
58
USNG - Waste water treatment - biological aspects
47
LWH - Agriculture - soil sciences
46
UPW - Drinking water
43
GTAK - Hydrogeology
42
UCS - Environmental chemistry
41
UPVF - Surface waters - streams, rivers, lakes
40
CHRV - Water and its properties
31
TNO - Nuclear reactor safety
30
UXS - Radioactive waste management
30
UAD - Environment - comprehensive works
29
GMAB - Hydrogeochemistry
28
LCO - Hydrobiology
27
USK - Waste water
27
UCQ - Environmental technology
26
USNH - Waste water treatment - special methods
26
UHN - Landscape ecology
25
UPTF - Organic pollutants in water
25
LCNC - Soil science - water transport
24
UCA - Environmental problems, man and environment - general aspects
24
USG - Waste treatment, waste disposal
23
UCE - Environmental impact, environmental pollution
21
UCGE - Control of environmental pollution - analytical methods
21
UPA - Water - handbooks
21
GTAP - Hydrological investigation methods
20
GAN - Geosciences - mathematical methods, computer applications
19
EHA - Renewable energy sources
18
EPK - Nuclear energy
18
LENI - Plant physiology - transport processes
18
LWE - Agriculture - general aspects
17
UAN - Environment - mathematical methods, computer applications
17
YEC - Law on waters
17
TNJ - Nuclear reactor technology
16
UA - Environment - general
16
GSC - Remote sensing
15
GVA - Oceanography
15
LCP - Limnology
15
UHP - Protection of nature and landscape
15
CWSW - Membrane separation process
13
more ...