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2. Study on containers, packages and household refuses;Takatsuki;Environmental Conservation Engineering,1983
3. Survey report on a small-fractionated physical composition of municipal solid waste;Kyoto City Bureau of Public Cleansing,1991
4. Law for the promotion of sorted collection and recycling of containers and packaging;Yoshida;Waste Management Research of the Japan Society of Waste Management Experts,1995
5. Recycled Paper Development Team: 100 pieces of knowledge about paper recycling;Honshu Paper Co., Ltd.,1991