4 sound discs (72:47)(72:51)(74:12)(74:30) : digital ; 4 3/4 in. + 1 booklet.
Notes
Booklet containing descriptions of the songs and index (60 p.) inserted in container.
Summary
Covers the songs and calls of 551 bird species living in western North America, named and ordered according to the 7th ed. of the Checklist of North American birds (American Ornithologists' Union, 1998).
