Excerpt from Wildlife and Range Research Needs in Northern Mexico and Southwestern United States: Workshop Proceedings, April 20-24, 1981, Rio Rico, Arizona Abstract.-this paper describes the northwest of Mexico, its physiography, climate, soil, and biotic associations, including the Ethnic Groups for their importance in the development of traditional technology. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.