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Explore the depths of geological science with the 'Professional Paper - United States Geological Survey, Issues 66-67.' This essential volume compiles research from the renowned U.S. Geological Survey, offering insights into diverse aspects of earth sciences. Dive into detailed studies covering geology, hydrology, paleontology, and related fields. Discover valuable data and analysis presented by leading experts in the field, making this an indispensable resource for researchers, academics, and anyone passionate about understanding the complexities of our planet. This publication provides a comprehensive look at significant geological findings and contributes to the ongoing dialogue within the scientific community. A must-have addition to any serious earth science collection.This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.