U. S. Centennial of Flight - History of Flight

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Images from: Lighter-Than-Air

	Zero-pressure helium balloon. Credit - ") 2001 National Air and Space Museum, Smithsonian Institution (NASM Videodisc No. 7B-33908)"
	Vega-2. Credit - ") 2001 National Air and Space Museum, Smithsonian Institution (NASM Videodisc No. 7B-33918)"
	Drawing of the Vega flights. Credit - NASA
	Test unit. Credit - NASA