Pollen analyses of Lignites.I.Three Pliocene Lignite Beds in the environs of Sendai.
Reference:
Shimada,M. (1951)
Pollen analyses of Lignites.I.Three Pliocene Lignite Beds in the environs of Sendai. Science Reports of the Tohoku University. Series 4. Biology
Vol. 19 # 1 P. 47- 50