Classification
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TEJ - Electric devices, mechanical devices, magnets, dielectrics
1
THH - Machines
1
THP - Pressure vessels, boilers, pipes
1
TKH - Air flight, space flight
1
TNE - Water cooled reactors
1
TNK - Nuclear reactor components - general
1
TNO - Nuclear reactor safety
1
UAM - Environmental models
1
UAX - Environment - information systems, literature guides
1
UCL - Environmental research
1
UCQ - Environmental technology
1
UEDM - Policy of clean air
1
UEF - Sustainability
1
UHC - Area planning and environment
1
UHN - Landscape ecology
1
UKB - Environmental effects and energy
1
UMN - Air pollution control and measurement
1
UPCE - Water chemistry
1
UPK - Water resources, water supply
1
UPN - Water protection, water quality, clean water
1
UPP - Water pollution
1
UPT - Water pollution control and measurement
1
UPV - Special waters
1
UPVF - Surface waters - streams, rivers, lakes
1
USGH - Contaminated sites
1
USGK - Waste incineration
1
UVF - Environmental aspects of heavy metals and their compounds
1
UXAH - Radioisotopes in water
1
YRE - Risk assessment
1
ZBJD - Libraries and library science - international
1
ZCE - Bibliometrics
1