Classification
UPT - Water pollution control and measurement
23
UPTF - Organic pollutants in water
3
UPTN - Inorganic pollutants in water
3
LCH - Ecology - methods
2
LKHE - Biochemistry - analytical methods
2
TBWB - Sensors (biological)
2
UAN - Environment - mathematical methods, computer applications
2
UPA - Water - handbooks
2
UPN - Water protection, water quality, clean water
2
CTYM - Trace analysis
1
UCGE - Control of environmental pollution - analytical methods
1
UMN - Air pollution control and measurement
1
USN - Waste water treatment
1