Donau

Bu kavram başka kaynaklarda da geçiyor

• DANUBE — Adair's New Encyclopedia (1923)
• Danube — A Geographical Dictionary of Milton (1919)
• Danube — Everybody's Encyelopedia (1912)
• Danube — Chandler's Encyclopedia (1898)
• DANUBE — Pears Shilling Cyclopedia (1898)