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File:"Marshall Falls" near Delaware Water Gap - from nature by J. Queen. LCCN2016649114.jpg - Wikimedia Commons
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A Gap in Nature: Discovering the World's Extinct Animals: Flannery, Tim, Schouten, Peter: Amazon.com: Books
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A Gap in Nature : Discovering the World's Extinct Animals: Amazon.co.uk: Flannery, Tim, Schouten, Peter: 9781876485771: Books
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Lehigh Gap Nature Center (Slatington) - 2020 All You Need to Know BEFORE You Go (with Photos) - Tripadvisor
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