Panel title. "637-40021B-DSC-Sept 93." Includes 3 insets. Text, ill., and descriptive list of trails on verso. Available also through the Library of Congress Web site as a raster image.
United States. National Park Service
<a rel="nofollow" class="external free" href="https://www.loc.gov/item/99443787/">https://www.loc.gov/item/99443787/</a>