geological service in Tsukuba Shi, Ibaraki Ken

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（株）ＥＬＳＳ

Tsukuba-shi, 305-0028 Tsukuba-shi, Japan

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地質標本館

Tsukuba-shi, 305-8561 Tsukuba-shi, Japan

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Science Museum of Map and Survey

Tsukuba-shi, 305-0811 Tsukuba-shi, Japan

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University of Tsukuba Tsukuba Campus

天王台1-1-1, 305-8577 Tsukuba-shi, Japan

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PWRI: Public Works Research Institute

Tsukuba-shi, 300-2621 Tsukuba-shi, Japan