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Author - title
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details | Eocene | Japan(Hokkaido I.) | Tokunaga,S. Fossil pollen and spore from the known coal seams in the Bibai area, Ishikari Coal Field, Hokkaido. | 1955 | |
details | Early Tertiary | Japan(Hokkaido I.) | Tokunaga,S. Pollen analysis of the known coal seams in the Biba Bibai area, Sorachi District, Ishikari Coal Fields, Hokkaido. | 1955 |