The songs and calls of 60 different, widely distributed birds of the United States and Canada reproduced on a 50-minute CD. Accompanying book describes and comments on the songs and calls on the CD. E
One of the outstanding problems of the biologist, whether he be beginning student or specialists, is that of understanding technical terms. The best way to understand and remember technical terms is
Detailed descriptions of insect orders, families, and many individual species are illustrated with 1,300 drawings and 142 superb color paintings. Illustrations - which use the unique Peterson Identi
