Search for: [Subject and Keywords = Poland] OR [Subject and Keywords = birds] OR [Subject and Keywords = periodicals] OR [Subject and Keywords = ornithology] OR [Subject and Keywords = Ornitologia \-\- czasopisma \[KABA\]] OR [Subject and Keywords = Ptaki \-\- czasopisma \[KABA\]] OR [Subject and Keywords = Czasopisma polskie \-\- 1945\- \[KABA\]] OR [Subject and Keywords = Czasopisma naukowe \-\- Polska \-\- 1945\- \[KABA\]] OR [Title = Acta Ornithologica \; vol. 28 \- Spis treści]