Excerpt from Soil Survey Field Book: Field Season, 1906 Two years have elapsed since the publication of the last issue of Instructions to Field Parties and Description of Soil Types. During these years the soils of many new areas have been studied and much a'dditional information in regard to the general relation of the soils of the United States has been obtained. The correlation of the soils is a very difficult problem, and one which can not be definitely solved from the data obtained by the survey of a limited number of widely separated areas. Each additional survey throws new light upon the subject, and sometimes necessitates changes in the soil names used in the earlier reports. The student of soils will doubtless realize that the necessity for such readjustments is an inherent feature of work of this character. 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.