Koivusaari J, Nuuja I, Palokangas R, Vihko V. Decrease in eggshell thickness of the Wite-tailed Eagle in Finland during 1884–1971. Ornis Fenn [Internet]. 1972Mar.31 [cited 2024May19];49(1):11–13. Available from: https://ornisfennica.journal.fi/article/view/132830