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Słowo kluczowe:
river valleys
Numbers of Garganey Spatula querquedula and Northern Shoveler S. clypeata in the Biebrza Marshes in 2018
26/02/2019
Changes in the abundance of waterbirds in the Narew and the Bug Valleys
29/08/2017
Changes in numbers of selected species during the non-breeding period in the central Północnopodlaska Lowland, in 2000–2011
31/07/2013
