Gemini Big “G”

 Fourteen photos of the proposed large Gemini capsule. “Big Gemini (or "Big G") was proposed to NASA by McDonnell Douglas in August 1969 as an advanced version of the Gemini spacecraft system. It was intended to provide large-capacity, all-purpose access to space, including missions that ultimately used Apollo or the Space Shuttle.” Credit and more info: Wikipedia

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Additional info and drawings here