Comprehensive studies on the change of trade acivities in the northern region of Japan archipelago by interviews and survey on material culture and artifacts

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In this research, I investigated the following two to Nivkhi which lives in the Nekrasovka in northern Sakhalin. (1) Interviews on the trade activities with Russian Coastal Regions, (2) Survey on their material culture and artifacts about trade activities. As a result, it turned out that trade activities of the residents between Russian Coastal Regions and Sakhalin were performed till the middle of the 20th century. Morever, it turned out the difference from trade activities were performed till the middle of the 19th century