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![Heliogyro solar sailer : summary report / by Richard H. MacNeal, John M. Hedgepeth, and Hans U. Schuerch. 1969 [Leather Bound]](https://m.media-amazon.com/images/I/31gqE8kgIYL._SL500_.jpg "Heliogyro solar sailer : summary report / by Richard H. MacNeal, John M. Hedgepeth, and Hans U. Schuerch. 1969 [Leather Bound]")
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