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Wataru HASHIMOTO
Tokyo University of Education
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Saburo KANNO
Joetsu University of Education
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Toshiaki TAKAYAMA
Kanazawa University
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Yasuhiko MAKINO
Ibaraki University
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Pacita P. DAVID
Philippine Bureau of Mines and Geosciences
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Pancrasio M. ALCANTARA
Philippine Bureau of Mines and Geosciences
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Jose N. ALMASCO
Philippine Bureau of Mines and Geosciences
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Rene DE LOS SANTOS
Philippine Bureau of Mines and Geosciences