《The Western United States》 - 免费有声读物

"In preparation of this book the author has had in mind the needs of the upper grammar grades. The subject matter has not been selected with the object of covering the field of Western geography in a systematic manner, but instead the attempt has been made to picture as graphically as may be some of its more striking and interesting physical features, and the influence which these features have exerted upon its discovery and settlement." (from the Preface of The Western United States)