Die Vogelstimmen Europas, Nordafrikas und Vorderasiens /The Bird Songs of Europe, North Africa and the Middle East
Comprises 17 Audio-CDs with 2,817 sound recordings of songs, calls and other signs of 819 bird species. The birds are systematically arranged by zoology so similar kinds can be easily compared. Includes 64 page booklet in German. English translation as a pdf file can be found on website.