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    Re: Lewis and Clark, and River Navigation
    From: Mitch B Burrill
    Date: 2003 Dec 3, 08:01 -0500

    I think the best mapping at 15 to 20 miles per inch is the Operational 
    Navigation Chart 1:1000000 series, published by NIMA.
    The entire earth is covered at $ 4.50 per sheet, an unbelievable bargain. They 
    are also available in digital form for free on the web under the alias "vmap 
    level zero".
    
    Mitch Burrill
    
    
    

       
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