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The Snake: A River in Trouble? Library of Congress The Library of Congress not only offers rich collections of digital resources. It also provides lesson plans developed by teachers Go to the site and assess the quality of the projects and units that match your grade level and assignment. Click here.         Credits: The drawings, photographs and graphics are by Jamie McKenzie. Some pictures are public domain from the Army Corps of Engineers. © 2000, Jamie McKenzie, all rights reserved. Copyright Policy: These pages may not be duplicated, distributed, redistributed or republished in any manner without express permission.