Maps generated from Portrait USA in this report are presented with permission of the American Geological Institute, Joint Educational Initiative. All images, illustrations, and text may not be duplicated without permission of the authors under the guidelines of current copyright protection laws. Permission to duplicate copies are extended to teachers for use as classroom instruction. Duplication or extraction of images, maps, or text for commercial use is not permitted without permission of the Webmasters. Portrait USA images are the intellectual property of the American Geological Institute.