from [www.nature.nps.gov/.../ 01_intro/012_intent.htm National Park Service]
Author
US National Park Service
This image is very small, unfixably too light/dark, or may not adequately illustrate the subject of the image. If a higher-quality version of this particular image is available, please replace this one; otherwise, a supplemental image illustrating this subject and available under a free license should be found or provided and uploaded as a separate file.