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Nagold Nagold (sông) Nagod Nago (định hướng)Tài liệu tham khảo
WikiPedia: Nagold (sông) http://udo.lubw.baden-wuerttemberg.de/ https://books.google.com/books?id=1yMXAQAAIAAJ https://books.google.com/books?id=kvJBAAAAYAAJ&pg=... https://archive.org/details/dictionaryofgeog00john... https://archive.org/details/dictionaryofgeog00john...