Lehman Caves...Its Human History: From the Beginning Through 1965 - Paperback

The National Park Service (NPS) was formed on August 25, 1916, and is the U.S. federal agency that manages all national parks, many national monuments, and other conservation and historical properties with various title designations.

The National Park Service publishes various reports and documents each year about environmental issues, park safety, and specific parks around the country. These publications include titles like: Vegetation of Shark Slough, Everglades National Park, Status of Woody Species in Big Cyprus National Preserve, and The Nest Environment of the American Crocodile.