Happy Birthday to the Richter Scale inventor: It's National Richter Scale Day - CBS Los Angeles
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The Richter Scale measures quakes in a range from 0 to 9. On the scale, each increase in number represents an earthquake 10 times more powerful.
NATIONAL RICHTER SCALE DAY: National Richter Scale Day on April 26
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National Richter Scale Day, Date, History, Celebration
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Guinness World Records 2014
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Art Blog Kate Vass Galerie — Kate Vass Galerie
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NATIONAL RICHTER SCALE DAY - April 26 - National Day Calendar
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Richter Scale's developer was a scientist with Butler County roots
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NATIONAL RICHTER SCALE DAY - April 26 - National Day Calendar
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Art Blog Kate Vass Galerie — Kate Vass Galerie
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1981–82 Volume 105 No 1–5 - Phi Delta Theta Scroll Archive