English: Structure and Affinities of the Petrified Plants from the Cretaceous of Northern Japan and Saghalin VII. A Petrified Pinaceous Cone from the Upper Cretaceous of Hokkaido
Japanese: 北日本及びサハリンの白亜紀産石化植物Ⅶ. 北海道上部白亜系産マツ科の球果