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This collection comprises issues 66-69 of the ’Water-Supply and Irrigation Papers of the United States Geological Survey.’ These papers provide detailed studies and data related to water resources, irrigation practices, and hydrological surveys conducted by the U.S. Geological Survey. The reports offer valuable insights into water management strategies and the scientific understanding of water-related issues during the period of their publication. Researchers, historians, and professionals in civil engineering, hydrology, and environmental science will find this collection an essential resource for understanding historical perspectives on water resource management and the evolution of hydrological research methodologies. The papers document early efforts to assess and manage water resources, making them relevant for contemporary studies in sustainable development and environmental conservation.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.