Delayed departure of the swift (Apus apus) from Finland in the autumn of 1957
How to Cite
Koskimies, J. (1961). Delayed departure of the swift (Apus apus) from Finland in the autumn of 1957. Ornis Fennica, 38(3–4), 105–127. Retrieved from https://ornisfennica.journal.fi/article/view/132665