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David David Villa David Beckham David de Gea David Silva David Alaba David Luiz David Ospina David Livingstone David GinolaTài liệu tham khảo
WikiPedia: David A. Johnston http://sthelenshero.com/DavidJohnston.html http://www.sthelenshero.com/Article.html http://www.tdn.com/app/helens/victims.php http://www.nps.gov/history/history/online_books/ge... http://vulcan.wr.usgs.gov/CVO_Info/david_johnston.... http://vulcan.wr.usgs.gov/Volcanoes/WesternUSA/Cir... //www.worldcat.org/issn/0364-6017 https://books.google.com/books?id=2qfsQU4E3aEC https://books.google.com/books?id=CLaOwiHsusYC https://books.google.com/books?id=GT-UKfPDO-gC