Tiwari, R. S., & Schaarschmidt, F. (1975). Palynological Studies in the Lower and Middle Devonian of the Prüm Syncline, Eifel <Germany>. Kramer.
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Chicago-čujuhus (17. p.)
Tiwari, Ram Shanker, juo Friedemann Schaarschmidt. Palynological Studies in the Lower and Middle Devonian of the Prüm Syncline, Eifel <Germany>. Frankfurt a.M: Kramer, 1975.
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MLA-čujuhus (9. p.)
Tiwari, Ram Shanker, juo Friedemann Schaarschmidt. Palynological Studies in the Lower and Middle Devonian of the Prüm Syncline, Eifel <Germany>. Kramer, 1975.
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