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  The gallant five - Henrietta Siksek - Google Books

  http://books.google.de/books/about/The_gallant_five.html?id=Y3ZkAAAAIAAJ&redir_esc=y

  The legend of El-Khamsa, The Gallant Five, the progenitors of the five bloodlines of Arabian horses, and their young Bedouin masters.

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  R60/2

  https://web.archive.org/web/20080226112239/http://jeff.dean.home.att.net/slash2.htm

  All about the BMW R60/2 motorcycle: history, photos, specifications, and links.

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  Bicycle Design: An Illustrated History - Tony Hadland, Hans-Erhard Lessing - Google Books

  https://books.google.de/books?id=a4IUAwAAQBAJ&pg=PA131&dq=Edouard+Carl+Friedrich+Otto+dicycle&hl=de&sa=X&ved=0ahUKEwiR5qm4867VAh

  The bicycle ranks as one of the most enduring, most widely used vehicles in the world, with more than a billion produced during almost two hundred years of cycling history. This book offers an authoritative and comprehensive account of the bicycle's…

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  Bicycle Design: An Illustrated History - Tony Hadland, Hans-Erhard Lessing - Google Books

  https://books.google.de/books?id=a4IUAwAAQBAJ&pg=PA494&dq=celerifere&hl=de&sa=X&ved=0ahUKEwiQ887Uy73UAhUCxxQKHU4oDOoQ6AEIOjAE#v=

  The bicycle ranks as one of the most enduring, most widely used vehicles in the world, with more than a billion produced during almost two hundred years of cycling history. This book offers an authoritative and comprehensive account of the bicycle's…

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