Pennsylvania Caves and Other Rocky Roadside Wonders (Google eBook)
A roadside travel guide to and history of Pennsylvania's nine commercial caves and a wealth of other geographical sites within the state.
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Alexander Caverns Alleghenian Orogeny Allegheny anthracite anticlinal attraction AUTHOR'S COLLECTION Baker Caverns Bear Cave beneath boat boulder field calcite Canyon cave entrance cave's Caverns's ceiling Chestnut Ridge coal commercial cave conglomerate Coral Caverns County Creek Crystal Cave DEAN SNYDER Devil's Devonian Discovery circumstance dripstone east eroded feet flowstone formations formed Frozen Niagara Geology Giant Grotto Highway hillside Hipple hole Indian Caverns Indian Echo Caverns known Laurel Caverns legend limestone Lincoln Caverns located Lost River Caverns Loyalhanna miles Mountain natural nearby Nittany Onyx Cave opened operation Ordovician outcrop Park passage passageways Penn Penn's Cave Pennsylvania caves pillar Pottsville quarry quartzite road rock city Room sandstone seams Seawra Cave shales show cave sink sinkhole slope speleothems spring stalactites stalagmite stone stream subterranean surface synclinal tion tourists tunnel Tuscarora quartzite U.S. Route underground visitors wall Water Gap water table Wertz Whisper Rocks Woodward Cave