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  Category:Graptolithina – Wikimedia Commons

  https://commons.wikimedia.org/wiki/Category:Graptolithina?uselang=de

  Keine Beschreibung vorhanden.

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  OGND - results/titledata

  http://swb.bsz-bw.de/DB=2.104/SET=1/TTL=1/CMD?retrace=0&trm_old=&ACT=SRCHA&IKT=2999&SRT=RLV&TRM=172021952

  Keine Beschreibung vorhanden.

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  Graptolithen und Stratigraphie                                        Julia Fahlke

  http://www.allgemeine-geologie.de/grap.htm

  Keine Beschreibung vorhanden.

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  OGND - results/titledata

  http://swb.bsz-bw.de/DB=2.104/SET=1/TTL=1/CMD?retrace=0&trm_old=&ACT=SRCHA&IKT=2999&SRT=RLV&TRM=122284658

  Keine Beschreibung vorhanden.

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  OGND - results/titledata

  http://swb.bsz-bw.de/DB=2.104/SET=1/TTL=1/CMD?retrace=0&trm_old=&ACT=SRCHA&IKT=2999&SRT=RLV&TRM=11715430X

  Keine Beschreibung vorhanden.

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  OGND - results/titledata

  http://swb.bsz-bw.de/DB=2.104/SET=1/TTL=1/CMD?retrace=0&trm_old=&ACT=SRCHA&IKT=2999&SRT=RLV&TRM=116059532

  Keine Beschreibung vorhanden.

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  OGND - results/titledata

  http://swb.bsz-bw.de/DB=2.104/SET=1/TTL=1/CMD?retrace=0&trm_old=&ACT=SRCHA&IKT=2999&SRT=RLV&TRM=116080396

  Keine Beschreibung vorhanden.

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  The Quarterly Journal of the Geological Society of London - Google Books

  https://books.google.de/books?id=3F3zAAAAMAAJ&pg=PA456&dq=The+Constitution+of+the+Earth+oldham#v=onepage

  Vols. 1-108 include Proceedings of the society (separately paged, beginning with v. 30)

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  The Geology of Central Europe: Precambrian and palaeozoic - Google Books

  https://books.google.de/books?id=BR9FWgu2ps4C&pg

  This two-volume set provides the first comprehensive account in English of the geology of Central Europe. Written by more than 200 scientists from universities and research centres spread across Europe and North America, the 21 chapters are based on the…

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