The New Sailing Directory for the navigation of the North Sea, with all its harbours : and describing, most particularly, the different channels of the river Thames, from London, with the Eastern Coasts of Great Britain, from the downs to Shetland, inclusive, likewise the Coasts of France, of the Netherlands, Germany, Denmark, and Norway, to the Cattegat / composed from a great variety of original and valuable documents... by John Purdy, ..