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    Re: What is it?
    From: Marvin Sebourn
    Date: 2004 Dec 13, 10:36 EST
    Abney Levels, also: Geologists use them for field work, easier to use and more accurate (my opinion, but especially so, hand-held) than the clinometer on a Brunton Compass, for vertical angles.
     
    Marvin
    osugeography---.com
       
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