Early man and the ocean: a search for the beginnings of navigation and ... - Thor Heyerdahl - Google Books

https://books.google.de/books?id=0eyAAAAAMAAJ&q=paraca+skull&dq=paraca+skull&hl=de&sa=X&ved=0ahUKEwjgys__9b_TAhXKuRQKHczHBQY4HhD

Presents Heyerdahl's original research into ancient oceanic voyages, including the Kon-Tiki and Ra expeditions, which support his theories about prehistoric voyagers traveling across the southern Atlantic to Mexico