Thule culture was first identified in the Eastern Arctic by interdisciplinary researches of Danish scholars between 1921 and 1924. A team of anthropologists, archaeologists and natural scientists compiled a massive description of the Canadian Arctic on the fifth Thule expedition. Therkel Mathiassen added upon their research and claimed that the tradition had started out in Alaska, and that Thule hunting was based on the dog sled, the large skin boat and the kayak which enabled them to range over a much greater hunting territory, participate in widespread trade, and transport heavier loads. Mathiassen was right about his hypotheses and even mapped out the Thule migration and interaction with Greenland.