I am greatly indebted to Nils Sjödin, SMHI, for valuable help and guidance concerning the sections on echosoundings and bathymetric map construction, and for providing the figures to these sections. I would also like to thank Anders and Ramona Källström for their constructive remarks and linguistic revising, Marianne Berglund for typing the manuscript and Kerstin Andersson for drawing the maps and the diagrams. The work has been sponsored by the National Swedish Environment Protection Board.
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Dr. Lars Håkanson
- Springer Berlin Heidelberg