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Bloomberg Tradebook
A geolograph machine displaying the depth of a mine being drilled is seen here on a Barrett Resources coalbed methane drilling site just south-west of Gillette, Wyoming on Monday, July 23, 2001.  A blue tick mark is drawn every foot that the bit goes down into the ground.  The numbers at the bottom indicate the current bit depth to be 489 feet, roughly half of the wells eventual depth.  Photographer:  Daniel Acker.  Bloomberg News.