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Book Termik
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Cross Country Flying
Patrick ANDRE, Murat Cakmak, Burkhard Martens | xcturkey photos | Flickr
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Episode 153- Burkhard Martens and Thermal Flying | CLOUDBASE MAYHEM
Vielen Dank an Burkhard Martens aus dessen Thermikbuch
DHV Gleitschirm und Drachen fliegen - Deutscher Gleitschirmverband und Drachenflugverband: Burkhard Martens gewinnt die Flatlands
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paraglider Burkhard Martens
Thermal Flying Third Edition (Preview) by Cross Country Magazine - Issuu
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