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Anchor text: Diagrams of Rogallo's flexible wing

Wikipedia: Francis Rogallo

Anchor text: Catch-the-wind.de

Wikipedia: Tetrahedral kite

Anchor text: Diagrams of Rogallo's flexible wing

Wikipedia: History of hang gliding

Anchor text: Development of the FlowForm kite

Wikipedia: Steve Sutton (skydiver)

Anchor text: Pictures of the High Flying Competition of the Royal Aeronautical Society in 1903

Wikipedia: Baden Baden-Powell