Classification
UCS - Environmental chemistry
10
UAA - Environment - reference books
8
UAD - Environment - comprehensive works
8
UCA - Environmental problems, man and environment - general aspects
4
UCE - Environmental impact, environmental pollution
4
UCQ - Environmental technology
2
UEG - Environmental programs and expertises
2
LWW - Agriculture - transfer factors, radioagronomy
1
UMB - Atmospheric chemistry
1