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[文献書誌] Nishida,H.: "Petrified plants from the Cretaceous of the Kwanto Mountains,central Japan.III.A polyxylic cycadean trunk,Sanchucycas gigatea gen.et sp.nov." Botacal Magazine,Tokyo 植物学雑誌. 104. 191-205 (1991)
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[文献書誌] Nishida,H.: "Use of fluorescent microscopy in defining a small ligule like ovuliferous scal of a permineralized Taxodiaceous cone from the Upper Cretaceous of Hokkaido,Japan" Botanical Magazine,Tokyo. 104. 231-234 (1991)
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[文献書誌] Nishida,H: "Diversity and significance of Late Cretaceous permineralized plant remains from Hokkaido,Japan" Botanical Magazine,Tokyo. 104. 253-273 (1991)
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[文献書誌] Nishida,M.: "Structure and affinties of the petrified plants from the Cretaceーous of northern Japan and Saghalien VI.Yezosequoia shimanukii gen.et sp.nov.,a petrified Taxodiaceous cone from Hokkaido" Japanese Journal of Botany 植物研究雑誌. 66. 280-291 (1991)
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[文献書誌] ohsawa,T.: "Structure and affinities of the petrified plants from the Cretaceーous of northern Japan and Saghalien VII.A petrified Pinaceous cone from the Upper Cretaceous of Hokkaido" Journal of Japanese Botany. 66. 356-368 (1991)
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[文献書誌] Ohsawa,T.: "Stucture and affinities of the petrified plants from the Cretaceーous of northern Japn and Saghalien XI.A petrified cone of Sciadoーpitys from the Upper Cretaceous of Hokkaido" Journal of Phytogeography and Taxonomy 植物地理・分類. 39. 97-105 (1991)
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[文献書誌] 西田 治文: "キカデオイデア目の花構造" 日本植物分類学会報. 8. 99-109 (1991)
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[文献書誌] Nishida,M.: "Structure and affinities of the petrified plants from the Cretaceーous of northern Japan and Saghalien VIII.Parataiwania nihongii gen.et sp nov.,a petrified Taxodiaceous cone from the Upper Cretaceーous of Hokkaido" Journal of Japanese Botany. 67. (1992)
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[文献書誌] Stockey,R.A.: "Upper Cretaceous cones from Hakkaido:Araucaria nihongii sp.nov.Upper Cretaceous cones from Hokkaido:Araucaria nihongii sp.nov." Review of Palaeobotany and Palynology. (1992)