Conversation so far:
What was Thor Heyerdahl doing in 1955?
In 1955–1956, Thor Heyerdahl organized the Norwegian Archaeological Expedition to Easter Island.
Who was apart of Thor Heyerdahl's team which went to Easter Island?
Thor Heyerdahl's expedition to Easter Island's scientific staff included Arne Skjølsvold, Carlyle Smith, Edwin Ferdon, Gonzalo Figueroa and William Mulloy.
What did Thor Heyerdahl and the other expedition team members do while in Easter Island in 1985?
Thor Heyerdahl and the professional archaeologists who travelled with him spent several months on Easter Island investigating several important archaeological sites.
What were highlights of the dig during Thor Heyerdahl's 1985 expedition to Easter Island?
Highlights of Thor Heyerdahl's project include experiments in the carving, transport and erection of the notable moai, as well as excavations at such prominent sites as Orongo and Poike.
What else did Thor Heyerdahl's dig in Easter Island produce besides experiments in the carving, transport and erection of the notable moai, as well as excavations at such prominent sites as Orongo and Poike?
Thor Heyerdahl's expedition to Easter Island produced two large volumes of scientific reports.
What did the scientific reports of Thor Heyerdahl's expedition of Easter Island do?
Thor Heyerdahl later added a third scientific volume about the expedition of Easter Island.
What else did Thor Heyerdahl produce besides the three scientific reports?
In Easter Island: The Mystery Solved, Thor Heyerdahl offered a more detailed theory of Easter Island's history

Question: What was this book based on
Self-contained rewrite: What was Easter Island: The Mystery Solved by Thor Heyerdahl based on?