Classification
UPC - Water - general aspects
7
UPCE - Water chemistry
4
UPN - Water protection, water quality, clean water
3
UPA - Water - handbooks
2
CHRV - Water and its properties
1
CHTD - Chemistry of aqueous solutions
1
GMAB - Hydrogeochemistry
1
UPK - Water resources, water supply
1
UPP - Water pollution
1
UPPE - Biological indicators of water pollution
1
USN - Waste water treatment
1