Não informado. (1968). Bulletin of the Geological Society of Finland. Geological Society of Finland.
Chicago-viite (17. p.)Não informado. Bulletin of the Geological Society of Finland. Helsinki: Geological Society of Finland, 1968.
MLA-viite (8. p.)Não informado. Bulletin of the Geological Society of Finland. Geological Society of Finland, 1968.
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