Explore all nine of Pennsylvania's operating show caves and seven more from yesteryear. Here you'll learn how natural processes created the state's spectacular subterranean world and how humans came to interpret caves as tourist attractions. This rocky road trip also includes many other geologic wonders, such as coal mines, boulder fields, rock cities, ice mines, and profile rocks. Loaded with maps and vintage illustrations. Cover: Paperback; Published: 2004; Size: 9 x 6 in.; Pages: 248 |
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