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This week in Lehigh Valley history: Big earthquake rattles nerves in 2011; Slate Belt distillery explosion in 1921 (Aug. 22-28) - lehighvalleylive.com
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Earthquake that rattled Pennsylvania was 'very impressive,' Millersville University expert says - pennlive.com
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Earthquakes in Pennsylvania: While they're not uncommon, their source remains a mystery - pennlive.com
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USGS: 3.8 magnitude earthquake felt across WNY this morning | Public Service News | thedailynewsonline.com
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3.4 magnitude earthquake reported in Central Pennsylvania, felt in parts of Chester County | PhillyVoice
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