Biogenic opal indicating less productive northwestern North Pacific during the glacial ages von Narita, Hisashi, Sato, Masayasu, Tsunogai, Shizuo, Murayama, Masafumi, Ikehara, Minoru, Nakatsuka, Takeshi, Wakatsuchi, Masaaki, Harada, Naomi, Ujiié, Yukika

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