OK, well this was new to me, but does anyone know the parameters for the original North American Datum?  Not 1927 or 1983, apparently William Bowie propagated one in 1913?  I work for an archaeological firm and we recently acquired 1920-1930s topos for the LA basin, which I would like to try and get an accurate reprojection on.  I could resample them, but I'd rather try to make a .ref file.  Anyone have any ideas?
 
William Hayden
SRI

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