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Koch, R. E. (1926). MitteltertiƤre Foraminiferen aus Bulongan, Ost-Borneo. Eclogae Geologicae Helvetiae. 19(3): 722-759.
Koch, R. E. (1926). MitteltertiƤre Foraminiferen aus Bulongan, Ost-Borneo. Eclogae Geologicae Helvetiae. 19(3): 722-759.