Classification
UCA - Environmental problems, man and environment - general aspects
9
UCE - Environmental impact, environmental pollution
6
LCK - Ecology - general aspects
4
UHP - Protection of nature and landscape
4
UHN - Landscape ecology
3
LCM - Terrestrial ecology
2
UCG - Control of environmental pollution
2
UCJ - Environmental protection - general aspects
2
UCS - Environmental chemistry
2
YRB - Social sciences, sociology
2
GBH - Marine geology
1
LCD - Ecology - comprensive works
1
LWE - Agriculture - general aspects
1
LWF - Agriculture - methods
1
LWO - Agricultural ecology, sustainable agriculture
1
UAA - Environment - reference books
1
UAB - Environment - dictionaries
1
UCEB - Environmental pollution
1
UCL - Environmental research
1
UCN - Environmental education
1
UEA - Environmental policy and economy - general aspects
1
UEG - Environmental programs and expertises
1
UEN - Environmental economy
1
UEND - Environmental costs, environmental investments
1
UMRC - Effects of air pollution on plants and animals
1
UPP - Water pollution
1
UPVF - Surface waters - streams, rivers, lakes
1
URA - Soil chemistry
1
UXAL - Radioisotopes in soil and groundwater
1