Classification
LWE - Agriculture - general aspects
LWH - Agriculture - soil sciences
9
LEE - Botany - general aspects
7
UMV - Climatic change
6
ENA - Energy from biomass and waste
4
LTV - Green genetic engineering
4
LVE - Food science - general
4
LWO - Agricultural ecology, sustainable agriculture
4
UHP - Protection of nature and landscape
4
UEF - Sustainability
3
UHN - Landscape ecology
3
GRA - Meteorology
2
GTAK - Hydrogeology
2
GUA - Geography - general
2
LCL - Biotopes, ecosystems
2
LCMC - Plants - ecology
2
LWA - Agriculture - reference books
2
UPK - Water resources, water supply
2
UPN - Water protection, water quality, clean water
2
YUD - Comprehensive statistical data - Germany
2
AHF - Research and science
1
ECA - Energy resources
1
GBA - General geology, historical geology
1
GCAB - Regional geology - european countries
1
LAM - Biology - theoretical and philosophical fundamentals
1
LCK - Ecology - general aspects
1
LCV - Ecology - models
1
LEN - Plant physiology
1
LET - Phytopathology
1
LOL - Genetics - general aspects, classic genetics
1
LTU - Genetic engineering
1
LWF - Agriculture - methods
1
LWP - Agriculture - animal husbandry
1
UAX - Environment - information systems, literature guides
1
UCE - Environmental impact, environmental pollution
1
UCJ - Environmental protection - general aspects
1
UEN - Environmental economy
1
UHC - Area planning and environment
1
UKE - Environment and energy resources
1
UML - Air pollution by special sources
1
UUG - Environmental aspects of genetically modified organisms, viruses, genes
1
UVT - Environmental aspects of other hazardous materials
1
YPB - Economy - general aspects
1
YPS - Economy of the developing countries
1
YZA - Politics, political science
1