RAVN, .-. International Hydrographie Bureau: Abridged Manual of the Symbols and Abbreviations used on Charts. Monaco 1928. Geografisk Tidsskrift, [S. l.], v. 32, 1929. Disponível em: https://tidsskrift.dk/geografisktidsskrift/article/view/47755. Acesso em: 20 dec. 2024.