Hydrography – More than Nautical Charts, NOAA Publication
If you are interested in how charts are made, i.e hydrography, then this new NOAA electronic publication is for you. A handsome fifty-six page collection of historical and scientific articles is available free in both EPUB format and pdf format, see
http://www.nauticalcharts.noaa.gov/staff/news/2014/docs/135572_NOAA_Hydro-epubP7.pdf
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