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Jedediah Smith, first white man to reach the Lassen Peak area
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Peter Lassen leads immigrants past the peak to the Sacramento valley; Lassen Peak is later named after him
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Grover Godfrey; first recorded ascent of Lassen Peak
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Helen Tanner Brodt; first women to reach the top of the mountain
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Theodore Roosevelt establishes the Lassen National Monument
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Mount Lassen powerful eruption
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Monument expanded to establish the Lassen National Volcanic Park
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Naturalist Paul Schulz documents 30 steam vents at the summit of Lassen Peak
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13 seismometers placed to monitor continuing volcanic activity
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Summit Trail closed after tragic accident
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Summit Trail reopens