skos:altLabel | - Tigris
- Ra
- expeditions
- ''Ra''
- ''Ra I'' and ''Ra II''
- ''Ra II''
- ''Tigris'' expedition
- Heyerdahl
- Heyerdahl, Thor
- Norwegian Archaeological Expedition
- Ra I and Ra II
- Ra expedition
- Thor Heyerdah
- Thor Heyerdahl Ra expedition
- Thor Heyerdahl#Boats Ra and Ra II
- Thor Heyerdahl#Tigris
- Thor Heyerdahl's
- Thor Heyerdahl's expedition
- Хе'''є'''рда́л
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