About OISHI Masayuki
About Rissho Univ.
About Geographical Reports of Tokyo Metropolitan University
About mountain
About volcano
About volcanic ash
About eruptive activity
About history
About radiocarbon dating
About Yamanashi prefecture
About Nagano prefecture
About Holocene Epoch
About Yatsugatake Mountains
About 歴史噴火
About Quaternary
About Dating
About 八ケ岳
About 火山
About 中部日本
About 歴史
About 噴火
About 検証