Authors
Bożena Graca
Institute of Oceanography, University of Gdańsk, Gdynia, Poland
Maria Dudkowiak
Department of Environmental Protection and Hygiene Transport, Institute of Maritime and Tropical Medicine, Gdynia, Poland
© 2007 Bożena Graca, Maria Dudkowiak, published by University of Gdańsk
This work is licensed under the Creative Commons License.