《Introduction to the Birds of Pennsylvania》 - 免费有声读物

George Miksch Sutton was a world renowned ornithologist whose art and studies rival those of Audubon. In this volume Sutton presents brief descriptions of nearly 200 species of birds common to Pennsylvania, but whose range often covers much of the eastern United States and beyond. This book also features an invaluable introduction to the study of birds for the beginner. - Summary by Larry Wilson