Classification
LCP - Limnology
47
UPVF - Surface waters - streams, rivers, lakes
9
LGA - Zoology - reference books
7
GTA - Hydrology - general
5
UHN - Landscape ecology
4
GCAA - Regional geology - Germany
3
LCL - Biotopes, ecosystems
3
GPAC - Aquatic biology - geographical aspects
2
LCH - Ecology - methods
2
UCA - Environmental problems, man and environment - general aspects
2
UHP - Protection of nature and landscape
2
UPPE - Biological indicators of water pollution
2
UPT - Water pollution control and measurement
2
GBAK - Paleontology
1
GBC - Paleoclimatology
1
GCA - Regional geology
1
GTAK - Hydrogeology
1
GUAA - Geography - physical
1
LBLC - Paleontology - biological aspects
1
LCD - Ecology - comprensive works
1
LCM - Terrestrial ecology
1
LCO - Hydrobiology
1
LCR - Ecology of microorganisms - land and water
1
LEL - Botany - lower plants
1
LGR - Animal physiology
1
UCEB - Environmental pollution
1
UCGN - Control of environmental pollution - biological methods
1
UCJ - Environmental protection - general aspects
1
UCL - Environmental research
1
UPC - Water - general aspects
1
UPN - Water protection, water quality, clean water
1
UUD - Ecotoxicology
1