Classification
UMB - Atmospheric chemistry
16
UMD - Atmospheric models
4
GRAD - Earth atmosphere, weather
3
UMN - Air pollution control and measurement
3
UAN - Environment - mathematical methods, computer applications
2
UMK - Air pollution - general aspects
2
CLE - Combustion, flames, explosions
1
CUG - Photometric analysis
1
CXME - Fossil fuel residues - fly ash, coal ash
1
FHG - Electron microscopy
1
GRA - Meteorology
1
UCS - Environmental chemistry
1
UMC - Atmospheric physics
1
UMEE - Clean air planning
1
UML - Air pollution by special sources
1
UMNC - Air pollution control by chemical analytical methods
1
UMNE - Air pollution by gaseous pollutants
1
UMNL - Environmental aerosols
1