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Guidance to take into consideration when looking to procure insurance for any volunteer work.
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Hourly heights, two months per page (A4 portrait)
Times and heights of high and low waters as in Format 12, but accompanied by interval heights (any time interval from a minimum of 1 minute to a maximum of 120 minutes)
This is a scanned version of a catalogue of charts and nautical publications produced by the Hydrographic Office available for purchase by the public in 1914
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