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  1. JackCrawford

    USGS 7.5 Quad maps' datum

    Many, if not all of the maps will indicate the datum. The one I have in front of me tells me it is based on NAD 27, but that I can line up with the NAD 83 by shifting the projection lines by a certain amount.
  2. JackCrawford

    Concrete friction coefficients

    Flamby (or anyone else), Any chance you can point to a reference for the use of 0.3 to 0.4 for seperately cast concrete? We're trying to verify that concrete traffic barriers can be used as ancorage points against a lateral load. Thanks, Jack

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