• 

  Thomas Geissmann's Gibbon Research Lab. and the Gibbon Network

  http://www.gibbons.de/

  Gibbons or small apes (Hylobatidae): Introduction to gibbon natural history, systematics and singing behavior; photo and sound galleries of all species; research articles and news.

• 

  Thomas Geissmann's Gibbon Research Lab. and the Gibbon Network

  http://www.gibbons.de

  Gibbons or small apes (Hylobatidae): Introduction to gibbon natural history, systematics and singing behavior; photo and sound galleries of all species; research articles and news.

• 

  Harm Thormählen

  http://www.hof-thormaehlen.de/thormaehlen/index.php?id=12

  Keine Beschreibung vorhanden.

• 

  GVK - Gemeinsamer Verbundkatalog - 2.1

  http://gso.gbv.de/DB=2.1/SET=2/TTL=11/CMD?ACT=SRCHA&IKT=1016&SRT=YOP&TRM=leslie+kaplan

  Keine Beschreibung vorhanden.

• 

  Auswärtige Mitglieder - Holsteiner Verband

  https://web.archive.org/web/20110430052856/http://auswaertige-holsteiner-zuechter.de/front_content.php?idcat=30

  Holsteiner Broodmare Lines

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