Depths shown by gradient tints. Title from panel. "*GPO:2015--388-43730558. New in 2015." Includes text and color illustrations. Text and color illustrations 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/2017590613/">https://www.loc.gov/item/2017590613/</a>