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Autogr. Hettner, Alfred(5)
Slg. Darmstaedter Ld 1889: Hettner, Alfred(5)
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Archiv d. Geol. Vereinigung Nr. 18039-18040(1)
Archiv d. Geol. Vereinigung Nr. 4515(1)
Bibl.Arch.III.G,Vol.523(1)
Cb 54.56:(1)
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Heid. Hs. 3695 EH 84(1)
Heid. Hs. 3929 D I,1(1)
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Heid. Hs. 3929 D I,102(1)
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Heid. Hs. 3929 D I,104(1)
Heid. Hs. 3929 D I,105(1)