Excerpt from The Geography of South Dakota: A Detailed Discussion of the Surface, Resources, Climate, Plants, Animals, and Human Geography Including the History of the Area; A Study in Regional Geography The following study is based on extensive field work and nearly all the available literature on the subject. The regular field work, done under the auspices of the State Survey, when Ellwood C. Perisho was State Geologist, occupied most or all of four seasons and involved reconnaissance work in more than three-fourths of the counties of the state and detailed work in several, (see the Geography, Geology, and Biology of South Central South Dakota and the Biology and Bio-geography of North Western South Dakota, Bulls. V and VI of the State Survey.) A resi dence in the state, extending over most of my life and including three years (1910-1913) as an instructor in the University of South Dakota, has greatly increased my knowledge of local conditions. Assistance in the field investigations was received from Dr. Perisho, then State Geologist, W. H. Over, Naturalist of the Survey, B. A. Iverson and Ralph W. Chaney, members of Survey field parties. Of the long list of publications dealing with the state from which facts have been obtained, special mention should be made of those of the first State Geologist, J. E. Todd. While writing the manuscript, many valuable suggestions were received from professoa's at the University of Chicago: Dean R. D. Salisbury, especially on chapters I-IV, VI; Dr. W. S. Tower on chapters I, V, VII; Drs. H. C. Cowles and Professor J. Paul Goode on chapters VI and VII; V. E. Shelford, o'n chapter VI; and Professor H. H. Barrows on chapter VII; and also my wife. Few changes have been made in the manuscript since February 1915. 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.