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middle Vistula River
4
B1-5802
3
Ecology
3
Environmental sciences
3
GE1-350
3
Philosophy (General)
3
QH540-549.5
3
envir
3
geo
3
Black-Headed Gull
2
Common Tern
2
active protection
2
avifauna of Vistula River
2
breeding success
2
causes of failures
2
gravel and sand mining
2
gulls and terns
2
river regulation
2
threats for riparian birds
2
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