This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book.

The 'Guide to the Geologic Map of Illinois' by the Illinois State Geological Survey is a comprehensive and meticulously detailed analysis of the geology of Illinois. The book provides an in-depth exploration of the state's geological formations, highlighting key features, rock types, and historical context. Written in a clear and informative style, the guide serves as an essential resource for geologists, researchers, and anyone interested in the earth sciences. This book not only serves as a valuable reference for understanding the geology of Illinois but also contributes to the broader field of geology with its detailed analysis and comprehensive coverage. The inclusion of detailed maps, charts, and illustrations further enhances the reader's understanding of the subject matter. The author's expertise and dedication to the study of Illinois geology shine through in this meticulously researched and carefully crafted guide. The 'Guide to the Geologic Map of Illinois' is a must-read for anyone looking to deepen their knowledge of the geological landscape of Illinois and beyond.

Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.