""Fifty Years����� Progress Of American Ornithology, 1883-1933"" is a book written by the American Ornithologists' Union that provides a comprehensive overview of the advancements made in the field of ornithology in the United States over the course of fifty years. The book covers a wide range of topics, including the history of ornithology in America, the development of new techniques for studying birds, and the discovery of new species. It also includes detailed descriptions of the work of prominent ornithologists of the time, as well as an extensive bibliography of ornithological literature. This book is a valuable resource for anyone interested in the history of ornithology in the United States or the study of birds in general.This Was Published On The Occasion Of Its Semi-Centennial Anniversary.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.