"*GPO: 1987--181-415/60136. Reprint 1987." Shows areas of different ecosystems. Depths shown by gradient tints. Panel title. Title at upper left: Big Cypress. Text, diagram of ecosystems, and col. ill. 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/91685088/">https://www.loc.gov/item/91685088/</a>