Censuses of the nesting birds of the island Lappören in Björkö, W. Finland
Viittaaminen
Hissa, R. (1964). Censuses of the nesting birds of the island Lappören in Björkö, W. Finland. Ornis Fennica, 41(3–4), 69–81. Noudettu osoitteesta https://ornisfennica.journal.fi/article/view/132697